Fixed bug that casued some probabilities to be larger than 1 (some of
the subgoals in current_subgoals were listed twice, once as a subgoal
on the shortest path and once as a confusion).

Reran analysis on default data set in calc (likelihoods-analysis-jul13c.ods), and extended
it to include graphs of even/odd correlations and ignore half of the
data (to be saved for final evaluations later on).