Preparation for generic user views
Added a getSuffixValues method that is meant to allow for having a
non-public field as key_name.
Also added support for a key-name field being embeded in the form so
that if the key-fields change the old key_name is not lost.
from django.dispatch import Signal
request_started = Signal()
request_finished = Signal()
got_request_exception = Signal(providing_args=["request"])