Put in a bunch of debug messages which are commented out in the search for why this triangle (and some others)  don't work right with the cylindrical cutter....
seems to have something to do with it being upside down.... as problem doesn't happen when right side up.
seems to have to do with the "circle_triangle" detection scheme.

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@1073 bbaffbd6-741e-11dd-a85d-61de82d9cad9