Setting truncate option for QString leftJustified method to false fixes 10 character truncation issue noted in issue 9489

size_t is not supported cv::Mat type

  * guard correctly in header file
  * guard correctly in cmake file

* Adds cv::resizeWindow() overload taking a single cv::Size argument.

* Replaces copied documentaion with Doxygen @overload command.

This function is the counterpart of "Context::getProg".
With this function, users have chance to unload a program
from global run-time cached programs, and save resource.

GSoC - Improving code match_template.py

* Unused variables
* Bad identation