[gtkada] variables

[Manuel Op de Coul]

If you generate the code with Glade, you will get record types with all
the widgets in them, so your program can access each.

But often it's not necessary to access them again after creation, so
they can be local variables in the Initialize procedure, and can even
be reused. So it saves pointer dereferences to do this, which saves a
little bit of program size.

Manuel