ENH: Update SimpleITK to release branch and simplify build system

This commit partially reverts r23052 that was adding workaround for
SimpleITK issues 517 and 518.

$ git shortlog v0.8.0..9cc5382466a945ded055bcd1a4f64bced810656d --no-merges
Bradley Lowekamp (8):
ENH: Adding UseHistograms options to LabelStatistics
Add initialization to the new parameter member variable.
Adding UseHistograms option to procedure and Execute methods
COMP: fix extraneous semi-colons at end of member function definitions
BUG: Fix potential missing library dependency in last BasicFilters library
BUG: Add SimpleITK_VERSION variable defined after find_package
Require SimpleITK major version to match for compatible version
BUG: Specify "Development" component for all headers

Hans Johnson (1):
COMP: Header guard typo mis-match

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23090 3bd1e089-480b-0410-8dfb-8563597acbee