fixed slow down in getRectSubPix (original patch by Markus JR Mueller); removed some unused variables and functions

Conflicts:

	modules/core/src/stat.cpp

Enable ipp MeanStdDev calculation for 32F_C1 images. Decrease accuracy sanity check of the perfomance test

When compiling without OpenCL, some classes from its namespace are still used in code.

Fixed a bug with the cv::format(cv::Mat, ...) method for matrices with only one row

see http://answers.opencv.org/question/21201/cvformat-does-not-format-the-way-it-should/?answer=23945#post-id-23945 for details