* switch from custom auth header to standard 'Authorization' bearer token header
* drops definition of custom schneider authentication header from settings
* refactors ParcelFetcher geom-shrinking code into own method for better maintainability
* 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