changed support for 3-channels, changed CCOEFF
changed CCOEFF cn==1
added dft for CCORR
used vector data types for CCORR cn==1
replaced factors computation by precomputed values, added kernel for
binary mode
Fixed core for CCORR and SQDIFF. Used float instead of int for CV_8U. Fixed conditions for call dft.
Updates python feature matching tutorial

The given ORB parameter was misspelled
Merge pull request #2892 from PhilLab:patch-1
Merge pull request #2786 from ElenaGvozdeva:ocl_matchTemplate
Merge pull request #2881 from mlyashko:moments_opt