Add performance tests for elementwise multiplication
Fix source code indents
Remove three sneaky tabs
Rewrite definition/declaration of variables to be more compact
added cv::reduce to T-API
Updated required CMake version in docs to match reality.
Move OpticalFlowFarneback from ocl module to video module
Fix compiler warnings. Add additional test case for UseInitFlow
Return false if ocl version not properly worked
Add perfomance test
added perf tests for stitching warpers
enabled tests
added perf tests for cv::reduce
Change epsilon value to 0.01
ported corners to T-API
Merge pull request #2156 from ilya-lavrenov:tapi_reduce
Merge pull request #2168 from ilya-lavrenov:tapi_perf_stitching
Merge pull request #2185 from ilya-lavrenov:tapi_corners
Change the sanity checking type to ERROR_RELATIVE
Merge pull request #2161 from SpecLad:doc-req