ENH: Do not mark TubeTK_USE_KWSTYLE as advanced.

Improve visibility.

Change-Id: Ibf73f89bdb0606b97079a2878f1fa9c37644c450
STYLE: Fix KWStyle errors.

Change-Id: I5fdd2b1759a23c773fa6ac13b674fa19d47232e4
Merge pull request #84 from thewtex/KWStyleAdvanced

Kw style advanced
FIX: Virtual environment setup
Merge pull request #88 from rkwitt/Fix-VirtualEnvSetup

FIX: Virtual environment setup
Merge pull request #87 from thewtex/BasePythonTests

ENH: Use virtualenv for Base/ and Applications/ Python tests.
ENH: Add USE_VALGRIND option
ENH: Add USE_SYSTEM_CPPCHECK option and optional Cppcheck superbuild
BUG: Fix USE_SYSTEM_KWSTYLE and refactor find_program(KWStyle)
BUG: Various minor CMake related bugs and style fixes
ADD: Test for TubesToImage

     Added test for TubeTK application TubesToImage.
Merge pull request #90 from rkwitt/TubesToImage-Testing

ADD: Test for TubesToImage
Merge pull request #89 from jamiesnape/CMakeRelatedFixes

Various CMake-related bug fixes and enhancements
BUG: Fix CTK superbuild
ENH: Simplify ImageToTubeRigidMetric.

Change-Id: I865b5cc8e0a4904905963de285af7b644f48d1bf
ENH: ImageToTubeRigidMetric: use CompensateSummation.

Improves robustness.

Change-Id: I7100e7328223d34cd4525e875ce6aeea2fb393a6
WIP: Factor out tube point weight calculation.

Change-Id: Ieea9acbd082daa5d1fd3c97a5b8593297ad43ed5