Develop Updates
* Bugfix in crystals: the `only_mcs` flag was not set for crystals. Hence, when it was being queried it often wrongly evaluated to `True`, skipping the the code that follows where the other material-dependent parameters were defined. The rest of material-dependent parameters hence became garbage, leading to wrong results. This bugfix has been spotted by chiaramaccani and accidentally fixed by bjorn.lindstromcern.ch
* Adapted `df.groupby` in `interaction_record` to be future-proof with pandas
**Full Changelog**: https://github.com/xsuite/xcoll/compare/v0.5.7...v0.5.8