Add a --screen option for setting the default screen. (Based on a patch

Add a --screen option for setting the default screen. (Based on a patch

Thu Oct 31 12:40:39 2002  Owen Taylor  <otaylor@redhat.com>

        * gdk/gdk.[ch] gdk/gdkglobals.c gdk/gdkinternals.h
        gdk/{x11,win32,linux-fb}/gdkscreen-{x11,win32,linux-fb}.c:
        Add a --screen option for setting the default screen.
        (Based on a patch from Balamurali Viswanathan, #81145)

        * gdk/gdk.c gdkdisplay.h gtk/gtkmain.c: Add
        gdk_display_open_default_libgtk_only(), so gtk_init_check()
        and gdk_init_check() can share the same behavior w.r.t.
        --screen.

        * gdk/gdk.[ch]: Make gdk_get_display_arg_name() G_CONST_RETURN.

        * gdk/x11/gdkselection-x11.c (gdk_selection_property_get):
        Suppress a spurious warning.

        * tests/testgtkrc: Remove someleft-over commented out
        includes that could be confusing.