added IPP optimization of separable 32f filters; fixed IPP version check in DFT; fixed conditions in IPP optimization of norm functions.

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

Made all STL usages explicit to be able automatically find all usages of
particular class or function.

extended morphological operations to handle arbitrary number of channels and CV_64F type; extended filter2D to handle CV_16S type. added test to check the supported formats; added description of supported formats in various filtering operations.

extended Sobel & Scharr description (ticket #1555). Added CV_32F/CV_64F format combination in sepFilter2D.

applied patch by Will Lucas; improved separable filter performance (in particular cv::GaussianBlur) on 16s images (for [much] faster SIFT)

replaced "const InputArray&" => "InputArray"; made InputArray and OutputArray references. added "None()" constant (no array()).

a big patch; use special proxy types (Input/OutputArray, Input/OutputArrayOfArrays) for passing in vectors, matrices etc.

reworked nearly all of the OpenCV tests (except for opencv_gpu tests) - they now use the Google Test engine.

fixed incorrect sign of the result of the convolution with normalized asymmetric kernels (ticket #779)