Revert "groovy uses python"

This reverts commit f7d59923e0c8ed895755fa6d6d4abdfd2dc6607b.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit cb8f5a2cc3242c8de793294bd6d049b0fd8790b2.
Rebase from 'upstream'
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python