Quota inconsistency when copying > 2GB of mails

[Ewald Dieterich]

Hi,

in Cyrus 2.3.13, when you do an IMAP COPY of mails with a total size of 
more then 2GB, the quota gets inconsistent because some variables 
overflow (at least on systems where sizeof(int) == 4).

The attached patch changes some data types so that IMAP COPY works 
again, but I'm not sure if this is a proper fix.

I think there is a similar problem in MULTIAPPEND (the total size in 
cmd_append() is declared as unsigned) but I didn't test it.

I filed bug 3127 in bugzilla.

Ewald
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