Fixed BORDER_REFLECT and BORDER_REFLECT_101 extrapolation for case x > 2*maxV
Added workaround for Nvidia: take into account that 3-channel vector type takes 4*elem_size in local memory.
Disabled minMaxIdx for 32FC1 since it occasionally fails on AMD devices (e.g. A10-6800K)
Removed redundant clFinish() after clEnqueueUnmapMemObject()

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Merge pull request #3187 from akarsakov:ocl_disabled_minmaxidx
Fixed calculation of l_stack_size
disabled IPP acceleration for 3-channel norms and for CV_8S only for APPLE
Merge pull request #3185 from ElenaGvozdeva:ocl_norm
Merge pull request #3186 from akarsakov:ocl_fixes
adding fourcc to VideoWriter docs

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Merge pull request #3167 from akarsakov:ocl_rm_clFinish
Merge pull request #3182 from berak:videowriter_docfix_30