Revert "groovy uses python"

This reverts commit f26781771e5373cce26d1d18e920d16a730efa91.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit 91c7dfffc464028e5530f54217ef9bd2561fec83.
Rebase from 'upstream'
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python