ENH: Update ITKv4 project to include latest release branch changes

This commit updates the version of ITK to what will be the 4.6.1 patch
release.
$ git shortlog 056d97b66..554e46a1
Christopher Mullins (1):
      COMP: Wrap MeshBase templates

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23727 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Update ITKv4 to include fix for repeated call to "find_package(ITK ..)"

Associated gerrit topic is:

  http://review.source.kitware.com/#/c/16963/

// ----------
Author: Brad King <brad.king@kitware.com>
Date:   Wed Sep 10 09:22:34 2014 -0400

    BUG: Fix itk_module_config for repeated calls

    Fix use of _${ns}_${mod}_USED settings to block reporting a module more
    than once in a single itk_module_config call.  Do not leak the
    _${ns}_${mod}_USED settings outside a single call to itk_module_config
    so that a future call to the macro with the same ${ns} will use a fresh
    set of modules.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23728 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Remove dependency on ITKDeprecated. See #3830

This commit updates ITK to include custom Slicer patch ensuring that
independently of the value of the ITKV3_COMPATIBILITY option,
ITKDeprecated is not include in the list of default modules.

It updates

  (1) BRAINSTools to remove ITKDeprecated from the list
      of required ITK components.

  (2) EMSegment to explicitly call find_package(ITK..) and use
      ITK_LIBRARIES variable when executable and library are added.

Note that at the time of this commit the pull request updating the
LASegmenter extension  to remove ITKDeprecated dependency is pending.
See https://github.com/ljzhu/LASegmenter/pull/2

// -------------
BRAINSTools updates:

$ git shortlog 6f99866..b82c7c8
Jean-Christophe Fillion-Robin (1):
      COMP: Remove ITKDeprecated from the list of ITK components.

// -------------
ITKv4 updates:

$ git shortlog baf8174bb..56fae278
Jean-Christophe Fillion-Robin (1):
      Ensure ITKDeprecated is always excluded from the default module list.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23729 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add option Slicer_ITKV3_COMPATIBILITY. See #3825

This option enabled by default will allow (if disabled) to build Slicer
with ITKv3 compatibility later disabled and ITK_USE_64BITS_IDS enabled.

Co-authored-by: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23730 3bd1e089-480b-0410-8dfb-8563597acbee