diff: rename --relative option to --root The diff output format is unable to express files outside the directory so it makes sense to name this option --root instead of --relative.

revlog: make converting from inline to non-line work after a strip The checkinlinesize function, which converts inline revlogs to non-inline, uses the current transaction's "data" field to determine how to update the transaction after the conversion. This change works around the missing data field, which is not in the transaction after a strip.