Beat grouping and reverting

[Trevor Daniels]

Carl

The mods to beaming which you made in August work really well, but one 
problem still remains.  It seems the simpler method of setting beatGrouping 
cannot be made to work for the 'common' time signature (i.e. those for which 
beam ending rules are defined in scm/auto-beam.scm) because it is not 
possible to revert the 'switch off at any beat' entry in scm/auto-beam.scm 
from within lily code.  So even if all the other entries are reverted this 
remaining entry still prevents beatGrouping taking effect.

First, is this right, and if so is there any way round it (other than 
editing scm/auto-beam.scm)?

I'm asking so I can ensure this is documented accurately.

Thanks

Trevor