* Adding constants to json file

* adding sub-module to constants name

* adding namespace to functions

* adding namespace to classes

* remove namespace from methods

* static methods

* python signatures generation

* python: more fixes for signatures generation

Python names existence can be checked via command:

    python -c "import cv2 as cv; print(repr(<py_name>))"

* Refactor Python Classes

Adding of destructor and placement new constructors for classes wrapped with CV_EXPORTS_W_SIMPLE macro

 - cv2.UMat implemented - python thin wrapper for UMat
 - no implicit copy from GPU to Host done, resulting UMat can be passed to next function without overhead
 - cv2.UMat.get() - to fetch data to Host
 - new tests covers: ORB, BFMatcher, goodFeaturesToTrack, calcOpticalFlowPyrLK

I had to make this modification locally to get opencv to build with python 2.6.  Python 2.6 requires indices in the format string (the `0` I added).  This requirement was relaxed in 2.7, so what used to be there would be working for people who could upgrade. I don't think the change has any negative consequences for future python versions, but I'm no expert.

whitespace fix

fixed find_obj.py

keep old const names for compatibility

maintain set of visited namespaces in CppHeaderParser
WARNING: REMOVED const name conversion (SomeConstName -> SOME_CONST_NAME), discussion needed

submodule method tables generation

gen2.py reports headers it processes
cmake file restructured

 - all parsed headers are included into "cv2.cpp" with "pyopencv_generated_include.h"
 - types starting with "Ptr_" converted to "Ptr<...>" form (avoids many typedefs in "cv2.cpp")

Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

Python 3 requires METH_VARARGS | METH_KEYWORDS, not just METH_KEYWORDS.

This protects from unwanted implicit conversions between types at compile time.

Also, removed the one from modules/python/src2/cv.py and cleared its
executable bit, since it's not a script.

* Drop some low level API
* Remove outdated overloads
* Utilize Input/OutputArray