add dovecot-pigeonhole pkg for sieve support
chg: dev: use tabs please
chg: dev: remove unused config files to have a clean folder @cosmetic
chg: dev: rename files to be dovecot valid
chg: dev: fix path for ssl config file
new: usr: support of sieve and managesieve with dovecot
chg: dev: rename files to start with core and not remove them @refactor
fix: dev: fix path in dovecot variables
fix: dev: typo @minor
new: dev: be valid with new dovecot configuration @refactor

'pop3s' protocol can no longer be specified (use protocols=pop3)
to disable non-ssl pop3, use service pop3-login { inet_listener
pop3 { port=0 } }
version update
update changelog file @minor