dovecot security and bug fix update

1.0.7-2 - LDAP+auth cache user login mixup CVE-2007-6598, 427575 - insecure mailextragroups option CVE-2008-1199, 436927 1.0.7-1 - update to latest upstream, fixes a few bugs 331441, 245249, plus two security vulnerabilities CVE-2007-2231, CVE-2007-4211 - increased default loginprocesssize to 64...