Make WeekDayFilter an Enum subclass, ensuring that such selectors can be wrapped
with Pattern selectors where no frequency qualifier is given.
client-editing-simplification
1# Local delivery to Cyrus: 2#local@$MAIL_DOMAIN lmtp:unix:/var/run/cyrus/socket/lmtp 3# Local delivery to Dovecot: 4#local@$MAIL_DOMAIN lmtp:unix:/var/run/dovecot/lmtp