Cleanup submission helper imports

Carsten Burgardrequested to merge
cleanup-submission-helper-imports into master

Release notes

Cleaning up the submission helpers a bit should allow to use them as a python-only component.

Details

In any setup (standalone or ATHENA), the framework can now be setup using the new -DNOCXX=1 CMake option, which will make sure only the python components of the framework are added. In this setup, cafsubmit can be used to submit jobs to batch.

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