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             tdemo_tree.py

Displays a 'breadth-first-tree' - in contrast
to the classical Logo tree drawing programs,
which use a depth-first-algorithm.

Uses:
(1) a tree-generator, where the drawing is
quasi the side-effect, whereas the generator
always yields None.
(2) Turtle-cloning: At each branching point the
current pen is cloned. So in the end there
are 1024 turtles.
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    l is length of branch
    a is half of the angle between 2 branches
    f is factor by which branch is shortened
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