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

Updated integrations for:
cv::split
cv::merge
cv::insertChannel
cv::extractChannel
cv::Mat::convertTo - now with scaled conversions support
cv::LUT - disabled due to performance issues
Mat::copyTo
Mat::setTo
cv::flip
cv::copyMakeBorder - currently disabled
cv::polarToCart
cv::pow - ipp pow function was removed due to performance issues
cv::hal::magnitude32f/64f - disabled for <= SSE42, poor performance
cv::countNonZero
cv::minMaxIdx
cv::norm
cv::canny - new integration. Disabled for threaded;
cv::cornerHarris
cv::boxFilter
cv::bilateralFilter
cv::integral

Updated comments for cv::ellipse and cv::ellipse2Poly to clarify some behaviour that has confused some users.

Amend: Delete trailing whitespace to make doc tests happy

https://www.mathjax.org/cdn-shutting-down/#alternative-cdn-providers