ENH: adding TIFFImageIO test for RGB palette images

Change-Id: I320acc8beac8225616451d11b291b1d7e12a17d0
DOC: Add migration guide for ::Zero and ::One

Change-Id: I8c50e517a2d8749d5bcb74f389cbf2d705df743e
ENH: Deprecate ::Zero and ::One

These were deprecated in 2012; just before the ITK 4.2 release.
ZeroValue() and OneValue() should be used instead.

Change-Id: Ia668c1f609483e93b627ce71974fc6ffbd994236
PERF: Don't recompute InternalInverse repeatedly

SpatialObject supposedly caches an InternalInverse transform
that's used by SpatialObject::IsInside to test if points
are inside the SpatialObject.  But a 'convenience' function
SetInternalInverseTransformToWorldToIndexTransform is called
at the top of IsInside in each of the derived classes, and
it was causing the inverse of the IndexToWorld transform to
be recomputed every time IsInside was called.

This patch just moves the GetInverse to where the IndexToWorld
transform is actually changed.

Change-Id: I616246263c1c0ba58dbef6ab0713fdbb2d0f05eb
Merge topic 'SpatialObjectInternalInverse'

97536593 PERF: Don't recompute InternalInverse repeatedly
Merge topic 'RemoveZeroandOneNumericTraits'

3f712cd0 ENH: Deprecate ::Zero and ::One
2e33b886 DOC: Add migration guide for ::Zero and ::One
Merge topic 'TIFFRefactorPerformance'

46f4125d ENH: adding TIFFImageIO test for RGB palette images