fixed canny test; fixed mhi-global test & implementation (hopefully, for the last time); added sse 4.1 & 4.2 support (not working in Xcode for some reason); moved splineInterpolation to color.cpp; fixed a few bugs in documentation

2) added mask support to device 'transform' function 
3) sample hog gpu: waitKey(1) -> waitKey(3), in other case image is not displayed.

Fairly certain that it builds now.

added hconcat & vconcat functions for joining matrices; moved some inline functions out of the headers; fixed several bugs in documentation; removed MatND from docs

mhi-global                   //ticket 457
canny                          //ticket 702

deleted NPP_VERSION and NPP_HAVE_COMPLEX_TYPE macros, because last NPP supports complex types under linux

integrated multi-threaded version of SURF (thanks to imahon and yvo2m for the patch; see ticket #275)