Made the following changes after code inspection (min_enclosing_triangle.cpp):

* Corrected minor typos in comments/function signatures
* Added new details to copyright statement
* Removed unreferenced macros
* Removed the assert statement which was checking the type of the OutputArray triangle
* When returning results using Mat::copyTo instead of Mat::convertTo
* Changed C-style casts to static_casts
* Added division by zero check to distanceFromPointToLine() function
* Updated reference webpages last access dates
* Moved the declaration of the gammaOfA variable outside the while loop in moveAIfLowAndBIfHigh() function for efficiency reasons