opencv

Merge pull request #3138 from alalek:icv_update

Merge pull request #3396 from akarsakov:ocl_pow_fix

Removed incorrect using of rootn() and powr() in ocl_pow

Merge pull request #3372 from pokeefe:add-test-for-projection-decomposition

Merge pull request #3391 from alalek:ocl_failure_messages