Added HocGraph class
fixed graph and cylinder draw methods
Merge remote-tracking branch 'pbmanis/master'

Conflicts:
	hocRender.py
Merge remote-tracking branch 'pbmanis/master'
Toward handling more HOC formats
Fixed cylinder rendering
support for section lists and section prefixes
Everything appears to be working..
hoc_reader: minor fixes, added update function.
minor fixes
Merge remote-tracking branch 'lcampagn/master'

Conflicts:
	hoc_reader.py