[PATCH] much faster deleting of messages from LocalStatus

[John Goerzen]

Michal Schmidt wrote:
> After tens of thousands of messages on the IMAP server were deleted it
> takes offlineimap extremely long time (several hours of high CPU usage)
> to delete them locally. It spends almost all the time modifying
> LocalStatus. It processes the messages one by one, rewriting the
> folder's status file in LocalStatus after each message.

Excellent, thank you.  I have applied this to my git repo and it will be 
a part of the next release.

-- John