[gnome-db] Replacing deprecated GTK+ 3 API

[Murray Cumming <murrayc murrayc com>]

In master, I have made some commits to replace the use of most
deprecated API. Hopefully things still work OK.

But there is still some use of GtkStyle (instead of GtkStyleContext)
that needs to be replaced. I couldn't see a way to copy a
GtkStyleContext, so I couldn't replace this code:
http://git.gnome.org/browse/libgda/tree/libgda-ui/data-entries/gdaui-entry-shell.c#n379

This is probably the only thing now stopping libgda from building with
no warnings, though I have disabled some warnings due to the sqlite and
lemon-generated code.

You can see the warnings about deprecated API if you use
--enable-warnings=fatal with configure.

-- 
murrayc murrayc com
www.murrayc.com
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