ENH: minor -- add default value into the warning if option had none provided
ENH: allow to force enable all jails (for testing), do not crash for jails without actions (just warn)

also a bit more explicit handling of regexp groups in splitAction
TST: basic testing of reading the shipped jail.conf (forcing all jails to be enabled)
ENH: postfix filter -- react also on (450 4.7.1) with empty from/to. fixes #126
Merge pull request #155 from yarikoptic/master

TST+ENH: enable basic (smoke) testing of the default jail.conf + improve postfix filter