RingDefinition - Beam rotation and Momentum Tolerance

Summary

I would like to be able to introduce an arbitrary rotation to beams in RingDefinition, independent of the azimuthal angle at which the ring is injected. At the moment, transverse "kicks" are enabled by BEAM_PRINIT but this does not permit full rotation through 360 degrees.

My use case: We decided at a recent meeting that for consistency with the ring layout on the ground in the ring we are designing, the ring should start at "12 o'clock" and proceed in a clockwise direction. OPAL-Cycl mode currently supports element placements in clockwise or anticlockwise direction but beam can only proceed in an anti-clockwise direction.