implemented saturate_cast on gpu; updated GpuMat::convertTo implementation with saturate_cast; minor fix of convert_to test

added cuda_shared.hpp header was reorganized in order to speed up compilation

implemented asynchronous call for GpuMat::upload() and GpuMat::download(). added test for asynchronous call.

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modified FernClassifier::train(); remove old RTreeClassifier and added new implementation CalonderClassifier; removed old find_obj_calonder and added new one

  - cvCreateOpenGLCallback: draw 3D on top of the image

bool not defined ? -> changed everything in int

Added implementation of remap on GPU. Minor fixes of convertTo. Added opencv_imgproc to gpu_test dependencies.

 - add CV_RADIOBOX with exclusive mode

 - cvAddButton changed to match requirement
 - CV_GUI_NORMAL and CV_GUI_EXPANDED done
 - context menu with right click

Fixed StereoBM_GPU kernel crash
Textureness threshold added