* adds exception catching if gibberish data is sent to POST endpoint of user data propagation
* commits 'changed' manage.py and jspdf.debug.js despite being identical with repo files (git wants it, git gets it)
* adds sso_identifier as new User model attribute
* refactors minor code snippets on user-propagation data resolving
* adds updating of username based on propagation data
* adds sso_identifier on admin backend view
* fixes documentation and variable names on oauth token revocation
* introduces private key for propagation
* changes key usage in decryption of propagated user data from oauth_client_id to private propagation key
mpeltriaux