6.4.94: Bugreport: (#1)
        While closing windows after connecting them to
        private colormaps, which use the store_base mechanism,
        Reason: Tk_FreeColor, free's colorcells in the
        base of the private colortable, which are still in use
        by other widgets.
        solution: replace Tk_FreeColor by an own function.
7.4.94: Fixed Bug #1, unfortunatly, one has to rebuild libtk !!!
