Fixed crash in SSE implementation of FREAK descriptor when number of pairs is set to something other than 512.

See http://code.opencv.org/issues/3889 for more details

In CUDA 6.0 there was a bug in NPP LUT implementation (invalid results when
src == 255). In CUDA 6.5 the bug was fixed.

Replaced NPP LUT call with own implementation (ported from master branch) 
to be independant from CUDA Toolkit version.

see https://github.com/Itseez/opencv/pull/3137

Conflicts:
	modules/core/src/matmul.cpp

A self-assignment leads to a call of release() with refcount being 2. In the release() method, refcount is decremented and then successfully checked for being 1. As a consequence, the underlying data is released. To prevent this, we test for a self-assignment

fix should be applyed for every window interface and generation