Latest invoice window edits gtk+ requirements

[Mike Evans]

I just compiled and ran the latest SVN and I now have no invoice windows
just the status bar.  This appears to be due the gtk+ requirement being
2.24.  The current gtk+ on my, regularly yum updated, Fedora 14 is 2.22.
Changing requirement in the glade file restores the page.

Could Geert downgrade the requirements for gtk+? Fedora 14 isn't
obsolete quite yet.

Selected log snippet:

* 17:00:26  WARN <gnc.gui> [gnc_builder_add_from_file()] Couldn't load
  builder
  file: /home/mikee/progs/share/gnucash/gtkbuilder/dialog-invoice.glade:
  required gtk+ version 2.24, current version is 2.22
* 17:00:26  WARN <gnc.gui> [gnc_builder_add_from_file()] Couldn't load
  builder
  file: /home/mikee/progs/share/gnucash/gtkbuilder/dialog-invoice.glade:
  required gtk+ version 2.24, current version is 2.22
* 17:00:26  CRIT <Gtk> gtk_box_pack: assertion `GTK_IS_BOX (box)' failed
* 17:00:26  CRIT <Gtk> gtk_box_pack: assertion `GTK_IS_BOX (box)' failed
* 17:00:26  CRIT <Gtk> gtk_box_pack: assertion `GTK_IS_BOX (box)' failed
...


Mike E