alternative implementation of point in triangle test
added 2nd eps and documentation
renamed existing test methods and introduced selection method
added second eps to old function to unify interface
adjusted tests
removed trianle-point-test using pointers to points and adjusted the one place where this was used
fixed comments and indentation
adjusted switch case for algorithm selection
Merge pull request #497 from rinkk/TestPntInTriangle

Add barycentric version of point in triangle test.