ENH: Remove ITK AnalyzeImageIO registration

Originally introduced in r824, the ITK AnalyzeImageIO have been
deprecated. The NIFTI ImageIO implementation is now able to read
analyze .img or .hdr files as well as the original Analyze ImageIO.

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

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23660 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Change required ITK version from 4.5 to 4.6

Starting with r23373 ITK 4.6.x is used to build and test Slicer.

$ git shortlog c127db8..6b5fa1a SuperBuild/External_ITKv4.cmake
jcfr (8):
      ENH: Update (1) ITKv4 from v4.5.2 to v4.6rc01 and (2) update BRAINSTools
      BUG: Update ITKv4 project to backport fix related to GDCMIO
      BUG: Update ITKv4 - Attempt to fix ResampleDTI tests
      COMP: Update ITKv4 - Fix "unused-local-typedefs" warning
      COMP: Move most of find_package calls into each Slicer sub-project.
      ENH: Move ITKv4 towards 4.6.0rc20140719
      ENH: Update ITKv4 and BRAINSTools
      BUG: Update ITKv4 and BRAINSTools - BRAINSFit performance improvement.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23661 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: In ITK 4.6, ImageIO GE5 is now registered by default.

No need to manually register the GE5 ImageIO because as of ITK 4.6 it
is registered by default with ITK.

Let's note the GE IO module is enabled by default and there is not need
to explicitly enable it when configuring ITK.

See InsightSoftwareConsortium/ITK@80cacdc

Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>

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

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23662 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Remove unused method Register/UnRegisterExtraBuiltInFactories

Originally introduced in r2733, after previous commit, these methods
are not needed anymore.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23663 3bd1e089-480b-0410-8dfb-8563597acbee
ENH: Update ITKv4 version to current release branch (7c3a15e-2014-09-03)

$ git shortlog 372991d..7c3a15ebc --no-merges
Bradley Lowekamp (2):
      BUG: Use METER of sCAL scale unit
      BUG: Use PNG_SCALE_METER for PNG sCAL unit

Christopher Mullins (1):
      COMP: Allows latex to compile for ITKSoftwareGuide

KWSys Robot (2):
      KWSys 2014-07-18 (65b36ede)
      KWSys 2014-08-04 (e787837a)

Matthew McCormick (9):
      BUG: Fix alpha assignment for RGBA TIFF.
      BUG: Improve thread-safety and performance of PCAShapeSignedDistanceFunction.
      DOC: itk::statistics -> itk::Statistics.
      DOC: Remove duplicate text in LaplacianRecursiveGaussian example.
      DOC: Fix Software Guide page overruns in IterativeClosestPoint{1,2}.cxx.
      BUG: TransformFileReader does not clear its TransformList.
      BUG: Prevent dangling pointer in HDF5TransformIO.
      COMP: Fix missing prefix in ITKv3ImageRegistration20Test.
      BUG: Do not return SmartPointers in TimeVaryingVelocityFieldTransform

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23664 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Proceed to MarkupsFiducial picking manager configuration only for VTK6.

This commit fixes regression introduced in r23648 that was preventing
Slicer from being compiled against VTK5.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23665 3bd1e089-480b-0410-8dfb-8563597acbee