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

Well,

I don’t understand : from what I can read in the docs, using a « CAR : » url should be valid, and indeed the a-rex starts, but it does not generate the same files as what is was generating when publishing into apel.
Then, running manually something like this :

/usr/libexec/arc/jura  -E 50 -u "CAR:" -o /tmp /var/spool/arc/jobstatus

Correctly generates the usagerecords files (but all of them) in /tmp and in /var/run/arc/urs…

I’ll try to fix that asap, but actually my patch do not break the previous behavior so I’d suggest merging, and then when I find what’s wrong I’ll open another PR ?

Regards