Revert "groovy uses python"

This reverts commit 65bc52e8d762751f02f16225a4fae2c388a11224.
Revert "Trimmed the branch to only the bayesian_belief_networks sub directory"

This reverts commit e37d59d69f457388e10faf5fb584a3580c5bf7a0.
Rebase from 'upstream'
Trimmed the branch to only the bayesian_belief_networks sub directory
groovy uses python