Apply all changes from MX server also to submission server

We only scan mails smaller than 20 MB, we check for spam on mails smaller than 5 MB. Need to be sure the HOME folder is set correctly for spamd. Set correct folder for bayes filter on spamd.
new: usr: update to new core-base image ffefd524-4e1e-11e4-9998-bf5009186c28
chg: doc: update changelog @minor
Merge branch 'master' into extra/dovecot-proxy

Conflicts:
	manifest