locking cleanups from Oswald Buddenhagen <ossi@kde.org>
* don't need to stat the lockfile since it will always be size 0
* only remove lockfile when we actually succeeded in locking
fixed segmentation fault caused by double free() when an error occurred
during the IMAP transmission.
fixed bug where isync could not handle a 0 value UIDVALIDITY
the uid for each message in the maildir is now stored in a dbm database
rather than the filename. this change was necessary because isync became
confused if you copied a message to another folder, in which case the uid
was invalid.
as a result of the above change, isync now acquires a mutex on the mailbox
to protect the dbm database from concurrent access.
main() was reworked to continue gracefully when an error is encountered, and
to always call maildir_close() so that the lock can be disabled, and the
database closed.
longer new.
don't set \Seen implicitly for messages in the cur/ folder. Require the S
flag on the message since Mutt will move Old (unread, but not recent)
messges into cur/.
now possible to sync multiple mailboxes by specifying multiple aliases on
the command line. IMAP connections are reused if possible.
don't initialize ssl unless we are going to use it.
display number of messages that are to be deleted
flags for \Recent messages were not properly fetched
local messages with updated flags were not corrected renamed
