Commit c37ec8e5 c37ec8e53426fee3e6b19cdc3d16f29c117bd6a4 by Sergey Poznyakoff

Reorganized. Default locking type is DOTLOCK.

If the mailbox to be locked is not writable for the user,
locking type changes to NULL (no locking at all). If the
directory where the mailbox resides is not writable, the
locking type switches to KERNEL.
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