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Logging in python wrapper

See merge request !405

Reorder cookbook sections and update style

See merge request !415

Test using numpy

See merge request !409

PERF: Optimize compare image

See merge request !410

The `DifferenceImageFilter` is often used on `VectorImage`s, in particular when
doing `compare-image`.

Creating new `VariableLengthVector` pixels at each iteration, or casting them
will automatically end up in construction and destruction of VLV pixels, and
thus allocation and liberation of heap memory. This is not efficient.

This commit aims at minimizing the number of allocation by factorizing out
everything that can be (pixel size, typical max value, typical zero value).
Resetting value is done by assignment, which has the good property of not
inducing any allocation on VLV variables.

PERF: Improve FunctorImageFilter performances

See merge request !413

`itk::UnaryFunctorImageFilter` only updates the progress reporter once per
line.
This commit mimics that behaviour.

The performance improvment is small, less than 10% on simple filters like a
scaling filter that multiplies pixel values.

Migrate developer's guide to the cookbook

See merge request !398

REFACT: Deprecate `auto_ptr`

See merge request !408

`auto_ptr` has been deprecated in C++11 and completely removed from C++17
standard.

This was the last occurrence of this class which emits a few warnings.

Fix typo in python error message

See merge request !407

ENH: replaced CallbackProgressReporter by a StandardOneLineFilter, renamed LogOutputCallback to SwigPrintCallback

DOC: remove the OTB-Data-Examples step from how-to-release

Closes #1847

See merge request !411

BUG: #1825: use GetParameterName to get real names on composite apps

Closes #1825

See merge request !406

FIX: correct a minor bug in Superimpose application

See merge request !403

CI: use lld linker on ubuntu

See merge request !399

Fix ImageFileReader error message & add back otb::Logger::BuildFormattedEntry

Closes #1850

See merge request !400