Allison Karlitskaya authored Nov 19, 2014 and Matthias Clasen committed Jun 05, 2015

Use the newly added g_settings_schema_list_keys() API instead of
g_settings_list_keys() in order to list keys.

Doing this allows the 'list-keys' command to work without creating a
GSettings object, which is more efficient.  It also means that we don't
have to provide a (meaningless and ignored) path when listing keys on
relocatable schemas.

While we're at it, update the 'range' command not to require creation of
a GSettings object, in a similar way.

https://bugzilla.gnome.org/show_bug.cgi?id=740308