Change the StoreFactory configuration to reference to a resource instead of
defining the whole database. Additionally fix docstrings, fix imports and fix
function calls to comply to coding style standards.
refs #4503
Create the DbAdapterFactory to instanciate db adapters, add resources.ini to configure resources, change
the authentication Manager to fall back to backends with lower priority in case
of errors, update the current UserBackends to the changed environment. Also
adjust the documentation and existing unit tests.
resolves#4503