missing methods in Glib::KeyFile?

[Mihai Niculescu <q quark gmail com>]

Hi,

I was playing with Glib::KeyFile and I observed there are no methods to
create (add) a new Group or a new Key to an existing group.
I think it would be useful to have such methods:
- add_group(Glib::ustring group_name) - to create a new group
- add_group(Glib::ustring group_name, Glib::ustring before_group) - to
create a new group before group named 'before_group'
etc.
similar thing for keys.