Wrong assertion in additional processing (1.3.x only).

fixes #73
evsched: Return -1 when cancel was not successful (due to event replanning)
Backported patch for journal corruption from master.
Backported event cancelation from master.
Bumped version.
Remove RRSet DNAMEs from helper trie before freeing them.

Refs #172
Merge branch 'fix-release' into 1.3