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Bug fix for dots.py
The bugs are: 1. Dots that go out of bounds are replaced at a random location. When coherence is high this results in a shift in dot density toward the edge where most dots are going out of bounds. When coherence is low it causes a shift way from all borders. This is because the dots are disappearing at edges to keep the distribution of dots uniform they should be reborn at the opposite edge. 2. When noise dots are in walk mode the dot directions are not updated often enough such that as the coherence changes some noise dots become signal dots but retain the ransom direction they had when they were noise. 3. Dot locations are not refreshed between trials. If dot lifetime is long (esp infinite) one can see clusters of dots consistent from trial to trail. This accentuates the bug in (1) when signal dots reverse direction between trials as the accumulated dots on one side of the field then all charge back across the field together. I’ve fixed these by. See dots.py attached
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