a getTool function for parametric paths

getTool

    def getTool(self,obj,number=0):
        "retrieves a tool from a hosting object with a tooltable, if any"
        for o in obj.InList:
            if hasattr(o,"Tooltable"):
                return o.Tooltable.getTool(number)
        # not found? search one level up
        for o in obj.InList:
            return self.getTool(o,number)
        return None

    def execute(self,obj):
        # ...
        if obj.Base:
            tool = self.getTool(obj,obj.ToolNumber)
            if tool:
                radius = tool.Diameter/2
            else:
                # temporary value, to be taken from the properties later on
                radius = 1
        #...