[Dovecot] Quota plugin rewrite

[Timo Sirainen]

Backported from CVS HEAD to branch_1_0. You can get it as a patch from
http://dovecot.org/patches/1.0/quota-rewrite.diff

New features include support for multiple quota roots, so you could have
eg. per-user quota and a larger domain quota (although no backend
actually supports this yet..).

The more important feature is that you can configure specific mailboxes
to have a bit more space available for them, such as Trash or Spam. The
configuration has also changed. Normally you'd use something like this:

  quota = maildir
  # 1GB quota in general
  quota_rule = *:storage=1048576
  # Trash mailbox gets 100MB more (so max. 1,1GB)
  quota_rule2 = Trash:storage=102400
  # Spam mailbox gets also +100MB (still maxes at 1,1GB, not 1,2GB)
  quota_rule3 = Spam:storage=102400

You can place all the above into plugin { .. } section in dovecot.conf.
In userdb if users have different quotas you'd then need to override
only quota_rule (not quota, quota_rule2 and quota_rule3).

I tested quickly that this seemed to work as described above. Please
test and report. :)

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