Apel enhancements + minor fixes

Hi,

I added a feature to prevent direct accounting publication.
In parrallel to that, I wrote a python / puppet thinguy that allows for directly publishing the ARC CE CAR records into an apel (EMI3) db, this is still beta/alpha, but I'm sure we want to keep our local history here, hence this PR.

See here for my arc to apel "bridge" which uses an apel server locally:
https://github.com/GRIF-IRFU/puppet-apeldbloader