add ontology batch parse processing

serializes ontology version parsing for import/sync/push
disable retrying ontology parsing
don't stop on hets errors
actually use the new parsing system
parallelize by files

ontologies of the same files are parsed sequentially
use current instead of last
fix looping of worker
Merge branch '405-wrong_version_analyzed' into develop
Merge branch 'develop' into develop.ontohub.org