Major cleanup of the unit test definition:
- Use official `post.sh` script for reference comparison
- Fix test dependencies. Previously all tests were run sequentially. In
  principle there could be a problem when multiple jobs try to write to
  the same PoolCatalog. If that happens we may need to define separate
  run directories for each test.
- Copy all references to git to avoid the awkward EOS copy. Some of the
  references are a few 100kB, however, they compress to almost nothing
  so this should not be an issue for git storage.
- Delete all obsolete test scripts.
- Fix a few mistakes in job options that the previous post-processing
  script missed.