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Multiple submissions with the same copy number

It appears that a simultaneous upload of multiple PDFs may bring the database into inconsistent state and create multiple submissions with the same copy number and exam id (originally reported in #137).

The likely fix is to commit the database as soon as we create new objects. This is not currently done in pdf_helper.process_page.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information