Adding missing credit for a function.

An SVM train with HOG could export a single vector for HOGDetector.

Added bugfixes
- Changed CV_WINDOW_NORMAL to 1
- Changed the help function to static
- Added extra help information on mask specifics

Request to comments on pull request for simplex method. In particular
*) while(1) is replaced with for(;;)
*) if(true){...} constructions in tests are replaced with #if 1 ...
 #endif

used implementation from highgui module

InputArray is a reference, and references are always constant anyway. Making
it const even causes a GCC warning.

Fixing failed build.

3.0 seems like an appropriate time to do that.

Conflicts:
	modules/core/include/opencv2/core/types_c.h
	modules/gpu/src/cuda/imgproc.cu
	modules/gpu/src/cuda/safe_call.hpp
	modules/gpu/src/error.cpp
	modules/gpu/src/imgproc.cpp
	modules/imgproc/src/distransform.cpp
	modules/imgproc/src/shapedescr.cpp
	modules/python/src2/cv2.cpp
	modules/python/src2/cv2.cv.hpp