updated todo list

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extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402222

docs/todo.txt

 
-fix the evidence nodes not green on open bayes net
-Add a stack trace thing
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-holding delete and selecting nodes in the bayes net gui throws exception
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-
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 Add asserts to text_grid and also
 move all the function bodies to cpp.