cmake/modules/FindVIGRA.cmake: Fix setting VIGRA_ROOT.
cmake/modules/FindVIGRA.cmake: Check to see if VIGRA_ROOT is already defined before searching.
cmake/modules/FindVIGRA.cmake: Move arguments to the other side of PATH symbol.
cmake/modules/FindVIGRA.cmake: Remove extra slashes.
cmake/modules/FindVIGRA.cmake: Remove unnecessary step of getting VIGRA_VIGRANUMPYCORE_LIBRARY_PATH.
cmake/modules/FindVIGRA.cmake: Output VIGRA site-packages too.
cmake/modules/FindVIGRA.cmake: Sort variables to require and export.
cmake/modules/FindVIGRA.cmake: Find and export VIGRA library dir.
benchmark_rank_filter.cxx -> src/benchmark_rank_filter.cxx: Moved to src.