perf tests: allow to skip performance tests
ocl: perf tests: skip tests if we fail check for maxMemoryAllocSize
fixes http://code.opencv.org/issues/3367
Merge pull request #1784 from SpecLad:ffmpeg-no-png
Merge pull request #1779 from perping:integral_2.4
Merge pull request #1786 from SpecLad:cap-images-file-pattern
added RGB[A] -> HSV[FULL] conversion
return when OpenCV is found
Merge pull request #1788 from alalek:perf_test_skip
added RGB[A] -> HLS[FULL] conversion
added HSV -> RGB[A][FULL] conversion
added HLS -> RGB[A][FULL] conversion
Slight modification to example code for FLANN matcher with comment on #3344
added RGBA <-> mRGBA
cleaner fix
Merge pull request #1790 from ilya-lavrenov:ocl_ref
Merge pull request #1792 from ilya-lavrenov:ocl_warp_eps
Merge pull request #1796 from ilya-lavrenov:ocl_cvtColor
Merge pull request #1794 from vrabaud:2.4
Fix building with FFmpeg 0.8.

avformat_find_stream_info was introduced in Libav avformat 53.3,
but it was only merged to FFmpeg in avformat 53.6.

In Libav avformat 53.3-53.5 av_find_stream_info is not removed
(only deprecated), so this shouldn't break building with that.