Overview of changes in 3.16.5
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* Bugs fixed:
 751524 Network changes cause authentication token timeouts
 752736 owncloud: Doesn't work with non-standard ports
 755168 owncloud, exchange: Sanitize HTTP error messages
 755316 imap-smtp: Fix typo in error message
 756494 identity: Don't ever nullify identifier
 756759 provider, telepathy: Small leak fixes
 758361 Crash in mail_client_check_auth_run_cb when goa_mail_auth_run fails