Allow ckermit into Belenos

As per BugRep 12442 https://trisquel.info/en/issues/12442 ckermit being freed has now percolated through to upstream. However, in Trusty ckermit is in Multiverse. Create a helper to bring it in.

mentioned in merge request !3 (closed)

Had feedback from @aklis in 658bd230 wrt copyright. Reworked to 5fd1b953 which has built on jenkins and resultant package tested by both @aklis and myself.

mentioned in merge request !4 (merged)

There were some old commits in trisquel/package-helpers!3 (closed) . Reworked after feedback from @ruben to trisquel/package-helpers!4 (merged)

mentioned in commit 11ff471c

mentioned in commit aklis/package-helpers@11ff471c

Status changed to closed

mentioned in commit 11ff471c

mentioned in commit mixalis/package-helpers@11ff471c