BUG: Update ITKv4 to include fixes for TIFF Reader/Writer

$ git shortlog 56fae27..8012ade --no-merges
Bradley Lowekamp (22):
      ENH: Extract TiffReaderInternal to separate file
      ENH: Refactor ReadTwoSamplePerPixelImage into template function
      ENH: Refactor GenericReadImage into template function
      BUG: Remove Zeiss 2-channel support code in TIFFImageIO ( and LSMImageIO )
      ENH: Refactor method to convert RGBA image to output buffer
      ENH: Refactor duplicated code to read a page
      BUG: Fix right oriented tiff images
      BUG: Remove dead separated plannar code, add test
      STYLE: Fix minor kwstyle defects in test and test results
      BUG: Use array delete operator for array new allocations
      ENH: add arbitrary TIFF TAGs to meta-data dictionary
      ENH: Reduce code duplicate in TIFFImageIO::ReadCurrentPage
      BUG: Address Coverity warning about null pointer dereferences
      ENH: Remove support for TIFF tile as 3D and dead code
      ENH: RGBA read images should stay unchanged.
      ENH: Refactor per pixel conversion function to per scan-line method
      PERF: Refactor color table lookup
      BUG: Adding missing parentheses around boolean expression
      ENH: adding TIFFImageIO test for RGB palette images
      ENH: Query libtiff to determine compression support
      BUG: Support TIFF tiled image with TIFFReadRGBAImage
      COMP: Add explicit conversion to const char

Matthew McCormick (1):
      COMP: Do not use _stat64 with MinGW-32.

Richard Beare (1):
      ENH: Include TIFF tags in the MetaDataDictionary

From: Bradley Lowekamp <blowekamp@mail.nih.gov>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23797 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Subject hierarchy tree headers show icons instead of text

The text in the narrow columns ('Vis' and 'Tr') looked quite bad, so instead it shows the show/hide icon for the visualization column, and a transform icon in the transforms column. The columns are now not resized when exiting then entering the module.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23798 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Add access to the currently selected module for testing convenience

This commit adds a Q_PROPERTY to qSlicerModuleSelectorToolBar to ensure it is
available from python. It also adds the convenience method to the
slicer.util python module.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23799 3bd1e089-480b-0410-8dfb-8563597acbee