* src/glade-base-editor.c, src/glade-editor-property.c:
  adapted to the new glade_command_set_property() prototype.

* src/glade-command.[ch]: changed prototype of
  glade_command_set_property(), added glade_command_set_property_value()

* src/glade-fixed.c: do not call gtk_widget_grab_focus() in
  glade_fixed_event() it makes widgets fight for the focus on some
  situations.

* src/glade-gtk.c: GtkEntry and GtkTextView support improved.
  Now text property can be edited from the instance itself.