Also fixed some typos and code alignment
Also adapted tutorial CPP samples
Fixed some identation problems

Overloaded the minEnclosingTriangle function such that there is an alternative function with the same name which does not require the output parameter ``area''.
Changed the sample source file minarea.cpp to use the overloaded version of the function.
Updated some comments in the min_enclosing_triangle.cpp source file.

Optimised one assert statement in the min_enclosing_triangle.cpp file. Added the minEnclosingTriangle functionality to the existing minarea.cpp sample file.