Return index to input vertices

[GoogleCodeExporter]

It would be very useful for me to include an index to the original polygons 
vertex-list to the points in the output, so that I don't have to find 
corresponding vertices by computing distances.

Original issue reported on code.google.com by [email protected] on 10 Dec 2013 at 3:08

[c42f]

This would also be very useful for me. I think the minimally invasive way to do it would be to simply add an integer index to TPPLPoint.

[aaronfranke]

@c42f Does PR #13 fix this issue?

[c42f]

Gosh this is a blast from the past. At this point, I'm not sure, but my past-self sure thought so when writing the description of #13. I think this can be closed.