Without additional check is angle negative or not in the LargeHole_DontFill
function this test case leads to stack overflow.
Signed-off-by: AndriyAndreyev <andriy.a.andreyev@gmail.com>
Data file format now has optional sections for holes polylines
and Steiner points identified with tokens "HOLE" and "STEINER".
Rework the data file dude.dat accordingly.
Add data file steiner.dat for an example with Steiner points.
