* Make calling groups useful
This makes config.Group.__call__ effectively an alias for Group.all(),
with the added bonus of becoming a context manager.
get_raw has been updated as well to reflect the new behaviour of
__call__.
* Fix unintended side-effects of new behaviour
* Add tests
* Add test for get_raw mixing in defaults
* Another cleanup for relying on old behaviour internally
* Fix bank relying on old behaviour
* Reformat