Fix Imap.php: Delete-Flag work's, but can't remove mail from server/mailbox

[DerDu]

You need to send "CLOSE" before "LOGOUT" to remove delete-flagged messages from active message box - or: provide (at least) a function to do so manually

Fix (partly) issue #1

[DerDu]

http://tools.ietf.org/html/rfc3501#section-6.4.2

6.4.2. CLOSE Command

Arguments: none

Responses: no specific responses for this command

Result: OK - close completed, now in authenticated state
BAD - command unknown or arguments invalid

  The CLOSE command permanently removes all messages that have the
  \Deleted flag set from the currently selected mailbox, and returns
  to the authenticated state from the selected state.  No untagged
  EXPUNGE responses are sent.

  No messages are removed, and no error is given, if the mailbox is
  selected by an EXAMINE command or is otherwise selected read-only.

  Even if a mailbox is selected, a SELECT, EXAMINE, or LOGOUT
  command MAY be issued without previously issuing a CLOSE command.
  The SELECT, EXAMINE, and LOGOUT commands implicitly close the
  currently selected mailbox without doing an expunge.  However,
  when many messages are deleted, a CLOSE-LOGOUT or CLOSE-SELECT
  sequence is considerably faster than an EXPUNGE-LOGOUT or
  EXPUNGE-SELECT because no untagged EXPUNGE responses (which the
  client would probably ignore) are sent.

Example: C: A341 CLOSE
S: A341 OK CLOSE completed

[ghost]

Your research just saved my life there! Thanks a lot and thanks for the provided code!