Revert "groovy uses python"

This reverts commit 55092bcf87dfb54b3b689bab782093a1fd182b11.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit dd1597e9451d52457d99ae457fc2b11193329f8d.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python