modified BackgroundSubtractorMOG2::getBackgroundImage so that it can now work with gray-level images.
Libraries filter update after abs path cut.
Merge pull request #2423 from RJ2:bugfix_5
Merge pull request #2400 from RJ2:Bugfix_2
Native camera fix for some deivices with Qualcomm SoC like Samsung Galaxy S4.
adding missing include (fixing 'no ocl implementation' error)
remove highlighting in some function links

1. Remove whole-document highlighting in some function links
2. fix the function alias `readwriteimagevideo`
Merge pull request #2510 from asmorkalov:android_cuda_filter_fix
Merge pull request #2501 from asmorkalov:android_native_camera_qualcomm
added gpu type selection in OPENCV_OPENCL_DEVICE parser
Multiple fixes in camera.

Fixed constant value for focus mode FOCUS_MODE_CONTINUES_PHOTO;
Add setters and getters for exposure lock and white balance lock flags;
Excluded camera restart for all setters except frame size.
Implicit linkage with CUDA runtime reverted.
Merge pull request #2454 from apavlenko:2.4_haar_extend
Added test code for I/O of user-defined types.
Fixed Load, Modify, and Save an Image tutorial
Keep definitions of link aliases consistent
Added guard to prevent from gpu module redefinition in OpenCV.mk
doc fix
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making OCL tests conform to the comon style