Fixed issue: Mat::copyTo(UMat) if device copy is obsolete. Added test.
fixed tests for ocl_filter2d, ocl_matchTemplate, ocl_histogram.cpp
fixed nDiffs for CalcBackProject
Fixed choice of kercn and rowsPerWI for non-Intel device.
some formal changes (generally adding constness)
fixing Mac build
fixing error, wrong template method param.
Fixed typos
fixed test ocl_MatchTemplate for sparse matrix
fix IOS framework
fix binary package build
small fix for GaussianBlur ocl test
Merge pull request #3062 from alalek:fix_ios_framework
Merge pull request #3060 from akarsakov:ocl_dft_fix
Merge pull request #3056 from akarsakov:ocl_setIdentity_fix
Merge pull request #3050 from ElenaGvozdeva:ocl_fixed_impg
Merge pull request #3055 from akarsakov:copyto_UMat_fix
Merge pull request #3064 from ElenaGvozdeva:ocl_GaussianBlur
Merge pull request #3065 from alalek:fix_binary_package_build
Merge pull request #3057 from Adil-Ibragimov:adding-constness