derive GimpGrid from GimpObject (not GObject) allowing us to use
* app/core/gimpgrid.[ch]: derive GimpGrid from GimpObject (not GObject) allowing us to use gimp_object_get_memsize(). Added missing copyright notice. * app/core/gimpimage.c: only call gimp_object_get_memsize() if gimage->grid != NULL. * app/gui/grid-dialog.c: added mnemonics, set shell->grid_dialog to NULL when destroyed. * app/gui/view-commands.c (view_configure_grid_cmd_callback): added call to gtk_window_present().
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