Revert "groovy uses python"

This reverts commit 5b51a6d921c4fe79f709aba8532768ba77a52efc.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit b68724a1d6006bd1d606eee96a60314a0d3b3d7e.
Rebase from 'upstream'
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python