put the detection-based tracker back (to objdetect module), so that the Android face detection sample builds fine. The patch by Konstantin Matskevich that adds C++11 threads support has been merged in too. Also, fixed compile error in the doc builder.

removed contrib, legacy and softcsscade modules; removed latentsvm and datamatrix detector from objdetect. removed haartraining and sft apps.
some of the stuff will be moved to opencv_contrib module.
in order to make this PR pass buildbot, please, comment off opencv_legacy, opencv_contrib and opencv_softcascade test runs.

Fix kernel compilation errors on AMD system

Fix licanse information in cl file

Support CV_64F destination type

Change build options of the kernel

Optimize sum of square

Remove separate kernel for integral square

Increase epsilon for perfomance tests

Increase epsilon for perfomance tests

Test double support on AMD devices

Fix some issues

Try to fix problems with AMD device

Try to solve problem with AMD device

Fix error of destination size in kernel

Fix warnings

The given ORB parameter was misspelled