Revert "groovy uses python"

This reverts commit 258778a11adb9a0f872ffaf29e0af81f0926d633.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit 1a172a9658c88f19d9bc40d5891f0ae0a95e2bf9.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python