Issue 8647: Updated doc for cv::matchTemplate to reflect current support for methods when mast template is supplied.

Added default parameters for minDisparity, numDisparities and blockSize. This fixes a bug where SGBM::load would not compile.

Spell correction

Corrected the spelling which was used in explanation for parameters.

from linked targets of base modules

This updates the public headers to use _Nm instead of _N in templates
since _N is defined by the widely used ctype.h.

- persistence.cpp code expects special sizeof value for passed structures
- this assumption is lead to memory corruption problems
- fixed/workarounded test to prevent memory corruption on Linux 32-bit systems