Added v4l2 support for getting capture property CV_CAP_PROP_POS_MSEC
make the sparse method give correct results on CPU ocl
Add CL_CPU to supportsFeature check
simplify the logic of pyrlk
fix hog on some CPU device running ocl
fix some mismatch on cpu device running OCL
move the "cpu device checking" from supportsFeatures() to queryDeviceInfo()
Fix the problem of device selection on hybrid video systems.
Merge pull request #740 from evil0sheep:2.4
Merge pull request #742 from bitwangyaoyao:2.4_fix