* And flags to prevent loading of items when creating a
SecretCollection object
* Rename secret_service_ensure_collections() to
secret_service_load_collections()
* Turn secret_service_search() and friends into a more convenient
API, so that callers can get attributes, unlocking, and secrets
if so desired.
* Also support retrieving either one secret, or all of them.
* The SecretService methods aren't used as frequently as the
password methods, and it's not really necessary to have a whole
bunch of extra varargs functions.
* Add varargs functions for building a GHashTable of attributes
* 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
* Schemas can also be created dynamically
* Correct introspection types for hash tables passed as args
* Validate argument hash tables
* Add some predefined schemas
* Allow allocation of pageable passwords from lookup functions
