ENH: Improve ImageRegionReverseConstIterator doc.

Do not use legacy API.

Do not do non-const actions in the Const version.

Add Const version to the test.

Change-Id: I3d4eff406726a49e2b8b8509f5bc20a09203416a
BUG: fix include to the corresponding hxx

Test added for itkDomainPartitionImage
Test added for itkDomainPartitionImageWithKdTree

Change-Id: I4e33be8ccace723daff947713d4b3730fb1f6a41
Merge topic 'RegionReverseConst-doc'

1858f84 ENH: Improve ImageRegionReverseConstIterator doc.
Merge topic 'LevelSetDomain'

e813516 BUG: fix include to the corresponding hxx