Provide some alias methods to (un)subcribe to the event system.
Merge pull request #3286 from s0undt3ch/hotfix/event-un-subscribe-alias

Provide some alias methods to (un)subcribe to the event system.
clear up stack trace for Alt linux
It is 2013 now
update manpages for 0.12.0
Add new dsl to the release notes for 0.12.0