* We use secret_service_get() to lookup the default
SecretService in these cases.
* Use this functionality in the secret_password_xxx()
functions to greatly simplify them.
* And flags to prevent loading of items when creating a
SecretCollection object
* Rename secret_service_ensure_collections() to
secret_service_load_collections()
* Handled entirely on the client side.
* Schema names are stored in an xdg:schema attribute
* Add option to turn of matching on schema names. So that we can
lookup items stored by libgnome-keyring and others
* Change schema 'identifier' to 'name'
* Fix up tests
