(ViewPort._hit_point): Added optional parameter
size' defaulting to the previously fixed value 5.
Extended doc-string.
(Viewport._find_shape_in_layer): Resolved FIXME regarding flexibility
for symbols.
Now the size of the largest point symbol is determined to find out
about whether the point has been hit.
This fixes the problem that only clicks inside a fixed distance of
5 where found.
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trunk/thuban/Thuban/UI/viewport.py