ENH: Prefer inheritance from true_type / false_type and use remove_cv and remove_reference to remove some partial specialisations

ENH: Add Functor module with FunctorImageFilter, VariadicInputsImageFilter, VariadicNamedInputsImageFilter

Squashed commit of the following:

commit 5de2770a7b83e732a2520a3ba0cb019c3ff6e714
Merge: 72b6a70054 54e3008855
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 16:24:52 2018 +0100

    Merge branch 'functor_filter_named_inputs' into 'functorfilter'

    Named inputs in FunctorImageFilter

    See merge request orfeotoolbox/otb!290

commit 54e3008855f50fbf28f6d95bc6765d8e2acdeab4
Merge: 3fca72a99a 72b6a70054
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 15:59:50 2018 +0100

    MRG

commit 72b6a7005458a7b7a3a4e8c71e9a209807004dc3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 15:48:44 2018 +0100

    DOC: Fix ingroup tags

commit 266e71b26cf0f9e66c3f802c7c8172fe9e087ff2
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 15:47:14 2018 +0100

    ENH: Only pad input image that correspond to neighborhood

commit edbd1a2e198ff7a7576464c8531a8cee705a7c40
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:57:51 2018 +0100

    TEST: Test support of built-in math functions

commit 3fca72a99ab56884f4febe1bf0cc2d7eca003a55
Merge: 7cf407e68f dbe6f862a1
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:34:12 2018 +0100

    Merge branch 'functorfilter' into functor_filter_named_inputs

commit dbe6f862a167232729082d28d55206ecf0aa6113
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:33:49 2018 +0100

    COMP: Fix compilation error

commit 7cf407e68f36a6b1cc16fee0c2724b58058468f4
Merge: 10f1592e51 894e496f7e
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:31:54 2018 +0100

    MRG

commit 894e496f7e2a34e7ba94a1057aa6e36e1dd03050
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:14:30 2018 +0100

    DOC: Enhance doc of separate functors

commit fdd99a968ff83628e1dd5fddddbed95af1261f93
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:08:54 2018 +0100

    DOC: Enhance code documentation

commit d9aa111b0ec331e2ae541254cafbc9eb4cfbc64f
Merge: 4987d73dfc f34b7ce3af
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:52:12 2018 +0100

    MRG

commit 10f1592e519258d50df9bb2a88e11f6802fd926c
Merge: a5e6a982e4 f34b7ce3af
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:46:27 2018 +0100

    MRG

commit f34b7ce3aff61b419860345b11a1bccc5ae61abc
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:44:54 2018 +0100

    ENH: replace non const GetFunctor() by GetModifiableFunctor()

commit 609684607d1bdacc85de2a328d169701f406696f
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:40:03 2018 +0100

    TEST: Add more testing cases, and support non const operators

commit a5e6a982e42fc13760351f2a94f0ec06583549af
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:29:19 2018 +0100

    ENH: VNamed -> VariadicNamed

commit f4d94a6842c65dea3011da281f1ab5b53a2d6fdb
Merge: 0397595a53 490d8c3594
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:22:04 2018 +0100

    MRG

commit 4987d73dfca2b0d3cda1687d7747e329713e7cb7
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 16 17:35:34 2018 +0100

    ENH: Also support functors of the form void ()(Out&, const In&...)

commit 490d8c3594482cc752178a0a974d2a45f2012d9d
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 16 16:35:06 2018 +0100

    DOC: Enhance documentation

commit d8dffd444390bfa40f77014942e67a23ffe31e18
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 16 16:19:33 2018 +0100

    ENH: Rename (VInput -> VariadicInput) and add more checks

commit db803d3c173c919f55d0d183d33598176eedefc8
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 16 09:46:15 2018 +0100

    COMP: Fix static_asserts on pixel type detection

commit cbea423c464e7ce9c2a730ca3ebc8190410153ea
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Thu Nov 15 13:25:17 2018 +0100

    ENH: C++17 will ease this

commit 7eeb1909a9e68ad902512a8118933e9629e7770b
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Thu Nov 15 13:25:00 2018 +0100

    ENH: Add static_assert check to see if all parameters (and return type) of TFunction can be mapped to valid pixel types for Image/VectorImage

commit 0397595a538e42ead1aff893244a2ac7c2a09d43
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 13 16:25:58 2018 +0100

    ENH: Introducing named inputs

commit 09877b54dd023dcbcf6df4cf132d50d3ef18718b
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 9 16:36:38 2018 +0100

    COMP: Missing headers

commit 37527191ffad5cfa31af0f5969fefb278b2a1da3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 9 15:57:07 2018 +0100

    TEST: Use static number of inputs in tests

commit 1c18762dcd5b97723f2797fac9a01c722f3a1bb9
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 9 15:49:56 2018 +0100

    ENH: Add helper value for number of inputs

commit af3cc15b193c30adce8d5a2a3931793bd9346164
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 9 14:23:49 2018 +0100

    ENH: Add template using to ease the retrieval of input image types

commit cec704383bb272d5230dc3327a504bb2e649b552
Author: Victor Poughon <victor.poughon@cnes.fr>
Date:   Fri Nov 9 12:34:34 2018 +0100

    BUG: fix comment in macro syntax error

commit 17a4c5a43d46a5def1173a259e57a43f2f0944bc
Author: Victor Poughon <victor.poughon@cnes.fr>
Date:   Fri Nov 9 12:29:53 2018 +0100

    ENH: FunctorFilter: fix legacy SetInput and improve tests

commit 2d8c2a48827c2e04af075593fa630c0b578d9d82
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Thu Nov 8 15:42:37 2018 +0100

    ENH: Add tests and move useful functors to separate headers

commit e14ab465598a0416df11b9d0c0aaca1cfae69e7b
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 6 11:55:06 2018 +0100

    TEST: Fix header test

commit 28662af37e21e7d8cb7415d1f2d1214fe042bcce
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 6 11:53:25 2018 +0100

    ENH: Move functor filter to a dedicated Module

commit d10945d94498cca019f3fd20e6303d0deafc8d2c
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 6 09:19:39 2018 +0100

    ENH: Undef macro once used

commit 415c62199cf346076d513c1c2dbcb4e337835c21
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 5 16:49:38 2018 +0100

    ENH: Add macro and SFINAE to enable the old-style setters

commit 21ec65b56e67a7e617f48cd20aeddf86b17cdacc
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 16:01:18 2018 +0000

    TEST: More exhaustive testing of new filter

commit d487b755d98b7680566eec4883061cd5cc8d0c7a
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 15:37:20 2018 +0000

    TEST: Static checks for test

commit 0693ea954523410dba163a9b515d5cc5e91410c7
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 15:37:07 2018 +0000

    DOC: typo in documentation

commit 8a2147927287cb76edf62860a31ebd6b4fb14b14
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 14:41:19 2018 +0000

    DOC: Enhance documentation

commit f5f6bcf0e66fa7d499170a16a98348823267fdee
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 14:18:41 2018 +0000

    COMP: Code review (and adding a few examples with std::complex)

commit 82b8d997a6c93a8fdde2e6671085670e9df80795
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 16:44:05 2018 +0200

    COMP: include fixes

commit 0846f1a8c317c06f4f361785aa6514ff2561932e
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 16:34:28 2018 +0200

    DOC: add documentation (WIP)

commit 6eb7f0cac4adb1014a919ac9b9156bbb6fda3c05
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 15:52:48 2018 +0200

    ENH: Handle lambdas returning VariableLengthVector

commit 8f1f7f3b7b6b42ed92c99a08466f2f1ed07c99b3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 13:00:06 2018 +0200

    ENH: Filter working with neighborhoods

commit 5586c5693941e82a676b189a3a38dd3e1431f3d9
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 10:11:43 2018 +0200

    ENH: Handle output size

commit 6a49f5dfb6de0621f1e7c8a484a994bdf80df4ba
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 10:08:42 2018 +0200

    ENH: Handle output size (WIP)

commit e35859994919a91d8e5f330ad16564b6e4b9b689
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Oct 12 11:12:56 2018 +0200

    ENH: FunctorImageFilter starts to be fully implemented (WIP)

commit 6d10b55822c86d49500a3f2496424efffd259c85
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Oct 5 16:57:03 2018 +0200

    ENH: FunctorImageFilter is now fully variadic from Functor definition

commit a6399f2c25b7c94216862ef488f53676dcfc99be
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 2 13:28:29 2018 +0200

    ENH: experiment with variadic types (WIP)

commit d05c33744eb5528ccd50edac220d043c5b8faf3a
Author: Jordi Inglada <jordi.inglada@cesbio.cnes.fr>
Date:   Tue Oct 2 15:17:55 2018 +0200

    ADD: draft FunctorImageFilter

commit 8d4e8f1b2d6a05e1824d8966a452aee700d2d3f9
Author: Jordi Inglada <jordi.inglada@cesbio.cnes.fr>
Date:   Sun Sep 30 19:02:08 2018 +0200

    ADD: start of FunctorImageFilter

    A generic functor filter which
    1. can take and produce vector and scalar images
    2. with or without the use of image neighborhoods in input
    3. with NbInputs >=1
    4. and with any number of output bands

PKG: declare libomp as system lib in macOS package

See merge request orfeotoolbox/otb!294

COMP: fix OverlapSave filter on Windows

See merge request orfeotoolbox/otb!293

FFTW upgrade

See merge request orfeotoolbox/otb!292

Filtering warnings for clang7

See merge request orfeotoolbox/otb!287

BUG: #1761: make sure OpenMP runtime is loaded by the main executable

See merge request orfeotoolbox/otb!288

SuperBuild: the Ossim issue 2354 now affects all platforms

See merge request orfeotoolbox/otb!285

OpenMP fixes

See merge request orfeotoolbox/otb!283

This reverts commit ec9dc6a9.

COMP: fix ossim to build with clang7

See merge request orfeotoolbox/otb!284