Turtle graphics not flexible enough about style

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Style of the pen is set only once during initialization of the Turtle class. 
this keeps people from using the same instance when drawing different objects 
objects with different styles).

Instead of using several instances depending on the style the issue should be 
solved by storing the style information for each polyline seperately.

Original issue reported on code.google.com by [email protected] on 28 Feb 2010 at 11:52