Add info regarding sieve to config examples
[mms] Support IDN hostnames in e-mail address queries.
Default to IMAP defaults if not given in config
Optimize LIST command generation

Don't send select options if there are none.
[mms] Fix parsing IMAP mailbox list requests when UTF-8 mode is enabled.
[mms] Fix sending IMAP APPEND data when the UTF-8 capability is enabled.
Another fix for Collator testing

Use 'en_US' for locale, since that is what I am using natively and I
generated the tests/expected results