Mainly trying to match the tests over mkdir/rm, which seem to have a
good amount of coverage.
- Fixed issue where move's desination rid wasn't updated correctly if
the destination split.
- Prevented renaming into nonexistant directories.
- Fixed neighboring rid adjustment in rename (+1 not -1 silly).
- Fixed erronously updating the grm's rid during lfsr_fs_fixgrm. In the
"I can't believe this ever worked" category, it seems this usually
didn't cause issues since mid was often marked as removed, making the
erronously updated rid ignored.
Christopher Haster
a3579ec3e2