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
Merge pull request #89 from jamiesnape/CMakeRelatedFixes

Various CMake-related bug fixes and enhancements