Optimizations for OpenCL color conversion.
Fixes global size issue, adds #pragma unroll to loops
cv::calcHist
parallel version
added macro for denoting region for suppression of "Wdeprecated-declarations"
Merge pull request #2593 from arkunze:pullreq/140319-color
Merge pull request #2600 from ilya-lavrenov:ipp_calc_hist
Merge pull request #2607 from ilya-lavrenov:warn_sup
cvtColor