Added a flag and format parameter to make volta brackets follow the ABC standard, rather than calculating their length from the first ending and applying that to subsequent endings. The default behavior is no change, but "-R" or "the %%repeatstandard" parameter triggers the standard-compliant behavior (which is to ignore the length calculated in the first ending and just stop the bracket at the next double bar, or when explicitly stopped with a decoration).
Added a flag and format parameter to make volta brackets follow the ABC standard, rather than calculating their length from the first ending and applying that to subsequent endings. The default behavior is no change, but "-R" or "the %%repeatstandard" parameter triggers the standard-compliant behavior (which is to ignore the length calculated in the first ending and just stop the bracket at the next double bar, or when explicitly stopped with a decoration).