remove unused variable in LineSegmentDetectorImpl::compareSegments()
remove unused variable in erGrouping()
remove unused variables in OCL_PERF_TEST_P()
first attemp
verbose errors
added status check
fixed some errors
Merge pull request #2629 from maksqwe:unused_fix
fixes in imgproc
cmd option
Merge pull request #2628 from ilya-lavrenov:ipp_error_handling
cv::sort
cv:;sortIdx
added ippisFlip to cv::sort
cv::reduce (min/max to single column)
cv::reduce sum/avg
Merge pull request #2625 from ilya-lavrenov:ipp_reduce
Merge pull request #2622 from ilya-lavrenov:ipp_sort