Removes the test case filter that limits which results are included in plots/tables.

def do_rmfilter(self, arg):
        """Removes the test case filter that limits which results are included in plots/tables.
        """
        if arg in self.curargs["tfilter"]:
            if arg == "*":
                msg.warn("The default filter cannot be removed.")
            else:
                self.curargs["tfilter"].remove(arg)
                self.do_filter("list")