Copies mail messages specified by msglist to specified mailbox. Geeft TRUE terug bij succes, FALSE indien er een fout is opgetreden..
msglist is a range not just message numbers (as described in RFC2060).
options is a bitmask of one or more of
CP_UID - the sequence numbers contain UIDS
CP_MOVE - Delete the messages from the current mailbox after copying
See also imap_mail_move().