Schiller force model to be used instead of Guo on non-SRT
This is supposed to be equivalent to Guo, but confirmed to be working for non-SRT. Also includes two test cases:
- one that confirms momentum conservation for all available force models
- one that checks that the moments of the force look right, but only for Schiller and Simple force models
Fixes #11 (closed)
Edited by Michael Kuron