v22

GUI:
- Refactor handling of coordinate labels, units, and conversions.
- Simplify GUI views and frames, rm ItemCombo.
- Store instrument models one by one, rm InstrumentLibrary.
- rm circular include in JobsSet, merge class JObDataQueue.
- Unify names of classes and variables.
Core:
- Exact computation for small mesocrystals
Deployment:
- Python through wheels only