Walnut Shared HPC Cluster upgraded

The scheduler update from MOAB to MAUI went much smoother than anticipated, so we released the cluster early. Commands remain the same since MOAB and MAUI share most of their code base, and we stayed with the TORQUE/PBS resource manager, while upgrading it to the latest stable open source release. Jobs that were held in the queue during the update began running successfully; please check that they completed successfully as well. Basic job submission and completion has been verified.