This should allow many algorithms to take advantage of more parallelization
technologies.

e.g. <opencv2/core/core.hpp> become <opencv2/core.hpp>

Also renamed <opencv2/core/opengl_interop.hpp> to <opencv2/core/opengl.hpp>

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

Issues #2646

* reorder arguments
* rewrite accuracy tests
* replace doubles with integer arithmetic inside the main loop