Added a new config option chunks-per-wipe-cycle, default 129. This is the number of individual chunks that will be deleted at a time. This is not to be confused with chunks-per-deletion, which is the number of chunks that are checked during each deletion cycle.

The value for chunks-per-wipe-cycle must be greater than chunks-per-deletion * ticks-per-deletion / 5 so that deletion is guaranteed to be complete before another set of chunks is queued.