Fri Mar  9 14:57:17 2001  Tim Janik  <timj@gtk.org>

        * testgruntime.c: test program. covers run first/last/cleanup signal
        handlers, return value accumulator, signal string returns, and
        interface types in signal arguments.

        * gtype.c (g_type_value_table_peek): for interface types without
        value table, try looking up a value table from an instantiatable
        prerequisite type (this is safe as an interface may only have
        one instantiatable prerequisiste).
        (type_check_is_value_type_U): same here.

        * gsignal.c (g_signal_newv): assert that return types never have
        G_SIGNAL_TYPE_STATIC_SCOPE set.
        (g_signal_newc): only create class closure if the class_offset is not
        0.