Cleanup some OPAL-CYCL units
Just a quick note to record that I cleaned up units in the following places (it has been on my nag list for many months so finally I did it!)
- DumpEMFields -> RADIANS
- VariableRFCavity -> METRES
- Offset (Cartesian/Cylindrical) -> RADIANS and METRES
I note that the PROBE still is in MM