Incompatible with opencascade 1:7.9.1-1 plus namespace error in triangle.h

[GaryScottMartin]

1. The function Nodes() has apparently been deprecated in the current version of OpenCascade and must be replaced by the use of the function Node() in a way that is correct for the data structure being operated on.

2. the use of the unqualified endl in triangle.h produces a namespace error that may be corrected by the use of std::endl in its place or the addition of using namespace std; prior to class Point {.

[acwest]

@johslarsen fixed most of these issues, I had to fix a few more things for 7.9.x, in PR #6