PERF: Fix usage of ElementAt in PolyLineParametricPath to use const version

PolyLineParametricPath::Evaluate function uses VectorContainer::ElementAt function.

There are 2 function signatures of ElementAt, differing only by return type and function const-ness.
The non-const version of the function also calls Modified on its object, which is relatively expensive operation

Calls to m_VertexList->ElementAt() in PolyParametricPath:Evaluate result in the non-const version being used. This solution static_cast the m_VertexList object to the const version which will tell the compiler to use the const version of ElementAt.

Change-Id: If4d256c65bebe6a6d57092b8a091d8ae0305f61e
Merge branch 'release'

Conflicts:
	CMake/itkExternal_FFTW.cmake
	Modules/Filtering/DisplacementField/include/itkExponentialDisplacementFieldImageFilter.hxx
	Modules/IO/Meta/test/itkMetaImageIOTest2.cxx

Change-Id: I90aed47d2d52f0cdcf24d46942fd439db3e3a574
Merge topic 'BSplinerOrigin'

a4ca91b BUG:  Control point grid origin wasn't set correctly.
BUG: fix for overlay functor for llvm optimization bug

A varietly of overlay releated image filters were producing testing
failures with apple's llvm build 5658 compiler. The blending loop has
been manually unrolled as a work around.

This error was observed on mini6 on the dashboard.

http://open.cdash.org/viewTest.php?onlyfailed&buildid=2581686

Change-Id: If39f057d0e507395e4b2840c3ee3aba4d024d06c
Merge branch 'release-FixOverlayFunctor' into release
Merge branch 'release'
ENH: adding support for VectorImage output in LabelMapCountorOverlay

Adding GenerateOutputInformation methods to set the number of
componets in the output image to 3, to support VectorImages.

Change-Id: I0f103fc9d645e0e22645414d5b323612a8d618a8
BUG: Fix multi-object MetaIO reading for ASCII MetaVesselTube.

The code to avoid unrecognized characters at the end of a MetaVesselTube was
consuming the next object, in particular the ObjectType field, which interferes
with the ability read a scene file.

This patch is a backport to the release-3.20 branch.

Change-Id: I3c490ac14fff1bc1ad51a9d85b52ab04beb0540e
Merge branch 'metaTubeReader' into release-3.20
Merge branch 'release-3.20' into release
Merge branch 'release'
ENH: Creating a typedef for the modified time

Change-Id: I191bcb1f3a3f7509e4c6033e38182ce5f1c62162
Merge topic 'ModifiedTimeType'

cbf91c4 ENH: Creating a typedef for the modified time
ENH: Bump release branch CMakeLists.txt version to 4.2.1.

Change-Id: Ie160616486f1c8526372c85b50f89ede59a4d370
Merge branch 'release'

Conflicts:
	CMakeLists.txt

Change-Id: I258c059bf8f79be4f3932427c6a81607a231862c
KWSys 2012-05-02 (719638e2)

Extract upstream KWSys using the following shell code.

$ sha1=719638e233b560afb0d9a0afdcf23469dc1827fe &&
git archive --prefix=KWSys-snapshot/ $sha1 |
tar x
Merge branch 'upstream-kwsys' into import-KWSys-subtree

Change-Id: I4571230f491fab520c4b809809d035a2b6d0a740
Merge branch 'master' into import-KWSys-subtree

Change-Id: I203c40fc765894518b5467816c9bef16bcf4a834
KWSys 2012-10-01 (bab53989)

Extract upstream KWSys using the following shell code.

$ sha1=bab53989d7c4027259bff837574f75003396d59f &&
git archive --prefix=KWSys-snapshot/ $sha1 |
tar x

$ git log 719638e2..bab53989 ^341043cf --no-merges --oneline --abbrev=8
bab53989 Tell Git to check tab-in-indent and no-lf-at-eof
8115bd1b SystemInformation: Pass extern "C" functions to sigaction
4f4dd224 SystemInformation: Fix unused assignment warnings
6b26d2fe SystemInformation: Use ifaddrs.h only where available
381923ed SystemInformation: Use si_code constants only where available
8f85338c SystemInformation: Use execinfo.h backtrace only where available
a8e98f98 SystemInformation: Use Windows API more portably
750b4b5c SystemInformation: Use long long or __int64 only where available
8d2cafcd SystemInformation: Fix UNIX system includes for FQDN
857bda17 SystemInformation: Report more information
63cbea35 Add and configure developer setup helper scripts
924466f5 SystemTools: Fix accidental bitwise instead of logical OR
2f423229 SystemTools: Remove unused environ declaration
a49c2417 Disable warnings about MS deprecation of C library
e3390720 CTestConfig: Submit to dedicated KWSys dashboard
Merge branch 'upstream-kwsys' into import-KWSys-subtree

Change-Id: I24b57728dda637890ef19ef5f5925b8372acb380