Refactoring #1432

Updated by wuttke about 4 years ago

* specific tests for frusta that are true pyramids
* exact treatment of vertices that coincide
* -improve improve edge sum in q expansion- expansion
* -what what else limits accuracy of q expansion?- expansion?
* -try try q(sum E) vs sum(qE)- sum(qE)
* -other other input from FP literature?- literature?