Implicated in possible infinite loop/OOM problems.

1) user.number immediately after login() remains zero, but changes
   "sometime" after.  Avoid using user.number right after login()
   call to generate filename.  All data/user/0000.imap files can
   be deleted after this change.
2) Saving Seen data would modify the object storing it when binary
   seen values were used.  Use JSON.parse(JSON.stringify() to make
   a copy before saving and restore it afterward.  Should fix issue
   reported by nickshanks1 over IRC.

This falls squarely into the "How did that ever work?" category.

imapservice.js line 736: TypeError: line is null

<nelgin> Oct 12 16:05:41 bbs synchronet: srvc 0099 IMAPv4-TLS RECV: a UID SEARCH FROM "Michiel"
<nelgin> Oct 12 16:05:41 bbs synchronet: srvc 0099 IMAPv4-TLS !JavaScript  /sbbs/exec/imapservice.js line 1867: SyntaxError: missing ; before statement
<nelgin> I got a different type of error

when using iOS (iPad) mail client.

base.put_msg_header(). I just happened to notice this while making the last
fix committed. I'm guessing this particular code path hasn't been tested (?)

disabled since the header may later be written back to disk. Should fix
error reported by Ragnarok (DOCKSUD):
imapservice.js line 1763: Error: Message header has 'expanded fields'

May help with the invalid STATUS roundcube is sending from Krueger.

Do not use LOGINDISABLED with TLS connections.
Add support for CRAM-MD5 so it's RFC-3501 compliant to log in without TLS.

Fixes errors on sessions that do not authenticate before disconnecting.

the data/users/000x.imap files when many messages have been seen.

to spam the log unless you're working on the script itself.

response.

Fixes issues with STATUS command.

have a selected base can use it.

expect the Seen flags to be coherent across them... support this by leaving
the users IMAP status file open, and holding a lock on the first byte.

We now need to flush changes to the status file more often, and we need
to call file.flush() before unlocking.

1) Accept (and ignore) empty lines from remote
2) Explicitly call the garbage collector to prevent memory hoarding
3) If we fail to fetch a header, make up a dummy one

we call put_msg_header() later with this same message header.

Synchronet, this timeout has to expire before the service thread exits.

It appears the some clients don't obey this bit of the RFC:
           The STATUS command MUST NOT be used as a "check for new
           messages in the selected mailbox" operation

there anymore after this commit.

suffixes already.