ENH: Add Functor module with FunctorImageFilter, VariadicInputsImageFilter,...

ENH: Add Functor module with FunctorImageFilter, VariadicInputsImageFilter, VariadicNamedInputsImageFilter

Squashed commit of the following:

commit 5de2770a
Merge: 72b6a700 54e30088
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 54e30088
Merge: 3fca72a9 72b6a700
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 15:59:50 2018 +0100

    MRG

commit 72b6a700
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 15:48:44 2018 +0100

    DOC: Fix ingroup tags

commit 266e71b2
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 edbd1a2e
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 3fca72a9
Merge: 7cf407e6 dbe6f862
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 dbe6f862
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:33:49 2018 +0100

    COMP: Fix compilation error

commit 7cf407e6
Merge: 10f1592e 894e496f
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:31:54 2018 +0100

    MRG

commit 894e496f
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:14:30 2018 +0100

    DOC: Enhance doc of separate functors

commit fdd99a96
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 14:08:54 2018 +0100

    DOC: Enhance code documentation

commit d9aa111b
Merge: 4987d73d f34b7ce3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:52:12 2018 +0100

    MRG

commit 10f1592e
Merge: a5e6a982 f34b7ce3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:46:27 2018 +0100

    MRG

commit f34b7ce3
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:44:54 2018 +0100

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

commit 60968460
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 a5e6a982
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:29:19 2018 +0100

    ENH: VNamed -> VariadicNamed

commit f4d94a68
Merge: 0397595a 490d8c35
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Mon Nov 19 13:22:04 2018 +0100

    MRG

commit 4987d73d
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 490d8c35
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 16 16:35:06 2018 +0100

    DOC: Enhance documentation

commit d8dffd44
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 db803d3c
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 cbea423c
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Thu Nov 15 13:25:17 2018 +0100

    ENH: C++17 will ease this

commit 7eeb1909
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 0397595a
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 13 16:25:58 2018 +0100

    ENH: Introducing named inputs

commit 09877b54
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Fri Nov 9 16:36:38 2018 +0100

    COMP: Missing headers

commit 37527191
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 1c18762d
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 af3cc15b
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 cec70438
Author: Victor Poughon <victor.poughon@cnes.fr>
Date:   Fri Nov 9 12:34:34 2018 +0100

    BUG: fix comment in macro syntax error

commit 17a4c5a4
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 2d8c2a48
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 e14ab465
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 6 11:55:06 2018 +0100

    TEST: Fix header test

commit 28662af3
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 d10945d9
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Nov 6 09:19:39 2018 +0100

    ENH: Undef macro once used

commit 415c6219
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 21ec65b5
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 d487b755
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 15:37:20 2018 +0000

    TEST: Static checks for test

commit 0693ea95
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 15:37:07 2018 +0000

    DOC: typo in documentation

commit 8a214792
Author: Julien Michel <julien.michel@orfeo-toolbox.org>
Date:   Mon Oct 29 14:41:19 2018 +0000

    DOC: Enhance documentation

commit f5f6bcf0
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 82b8d997
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 16:44:05 2018 +0200

    COMP: include fixes

commit 0846f1a8
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 16:34:28 2018 +0200

    DOC: add documentation (WIP)

commit 6eb7f0ca
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 15:52:48 2018 +0200

    ENH: Handle lambdas returning VariableLengthVector

commit 8f1f7f3b
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 13:00:06 2018 +0200

    ENH: Filter working with neighborhoods

commit 5586c569
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 10:11:43 2018 +0200

    ENH: Handle output size

commit 6a49f5df
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 23 10:08:42 2018 +0200

    ENH: Handle output size (WIP)

commit e3585999
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 6d10b558
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 a6399f2c
Author: Julien Michel <julien.michel@cnes.fr>
Date:   Tue Oct 2 13:28:29 2018 +0200

    ENH: experiment with variadic types (WIP)

commit d05c3374
Author: Jordi Inglada <jordi.inglada@cesbio.cnes.fr>
Date:   Tue Oct 2 15:17:55 2018 +0200

    ADD: draft FunctorImageFilter

commit 8d4e8f1b
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