Fixes:
  - Submission type should only be required for SciPost Physics.
  - Changed failing jQuery CDN.
  - ArXiv query result html update to improve reading.
  - Summernote loading debugging (sometimes failed to load).

Contributors will now only be permitted to do a
resubmission if the current contributor is already
assigned as an author on the previous submission.

This will prevent other contributors be able to read
information which is meant for the EdCol+EIC only,
coming from the previous submission.