fix shadow warning in tbb sum unit test
restrict includes of boost.math to the parts that are actually needed
bad change in tbb sum test
change vector_of so that it doesn't rely on size of as_simd
Make rgb2yuv_simd consistent with related benchmarks
Added rgb2grey benchmark from WPMVP'14 talk
boost/mpl/sizeof.hpp include was needed
fix bug in erfc, causing problems in normcdf and kstest
Merge pull request #674 from MetaScale/issue_673

Issue 673
fix bad definition of NT2DebugEmpty config which led to redundant flags
typo in previous commit, don't re-put /W4 if already there