[gtkada] PRE-ANNOUNCE: GtkAda 2.4.0

[Arnaud Charlet]

This is a pre-announcement of the GtkAda 2.4.0 release in
source form for all platforms at

http://libre.adacore.com/GtkAda

If everything goes well, this same version will be announced within a few
days more broadly.

Do not hesitate to report success/failures with this package.

Included in this new release:

- Improvements in GtkAda.MDI
- Compatible with Gtk+ 2.4.x
- Compatible with latest Ada AIs
- Documentation updates
- Various bug fixes and missing functions bound

Have fun !

Arno