changed epsilon for test pass on Win32
changing default perf strategy from BASIC (old) to SIMPLE (new, faster)
Merge pull request #2503 from mlyashko:optflow_dualtvl1
Merge pull request #2491 from ilya-lavrenov:tapi_sep_filter
Merge pull request #2515 from apavlenko:perf_default_strategy
added 3-channels support to cv::Canny