gtkmm 3.0: Removing ListHandle, SListHandle, etc

[Murray Cumming <murrayc murrayc com>]

In gtkmm 3.0, I'd like to remove the intermediate container types
because they just confuse people and make it necessary to read the
documentation:
http://library.gnome.org/devel/gtkmm-tutorial/unstable/sec-intermediate-types.html.en

So, for instance, Gtk::FileChooser::get_uris() would return a
std::list<> or std::vector instead of a Glib::SListhandle<>:
http://library.gnome.org/devel/gtkmm/2.20/classGtk_1_1FileChooser.html#abe7450acc71c70b5f595f9e23224a24e

I think people generally agree with me about this, but I'd like to hear
about any objections.

Also, should we use std::list or std::vector? I suspect that std::vector
would be more useful.

-- 
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