Fix area calculation. No longer use cutlines, but use a representation
of disjoint closed polygons.
C implementation of angle
Python 3 fixes
Document unit of area.
Fix cross reference in docstrings
Modest speed improvement
Modest speed improvement in intersection
Fix C++ static initialization problem
Further speed improvements
Remove extraneous print statements
Merge pull request #45 from mdboom/fast-area

Correct area calculation