New code for 5.13:

- Various minor fixes in online scrub.
- Prevent metadata files from being automatically inactivated.
- Validate btree heights by the computed per-btree limits.
- Don't warn about remounting with deprecated mount options.
- Initialize attr forks at create time if we suspect we're going to need
  to store them.
- Reduce memory reallocation workouts in the logging code.
- Fix some theoretical math calculation errors in logged buffers that
  span multiple discontig memory ranges but contiguous ondisk regions.
- Speedups in dirty buffer bitmap handling.
- Make type verifier functions more inline-happy to reduce overhead.
- Reduce debug overhead in directory checking code.
- Many many typo fixes.
- Begin to handle the permanent loss of the very end of a filesystem.
-----BEGIN PGP SIGNATURE-----
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=o5Mn
-----END PGP SIGNATURE-----