Includes changes for:
* passwordless login using private key (defaults to passwd when keyfile is not specified)
* using "sudo" to exec commands (on jobtracker)
* adding a new error message (ERROR_CATCHALL) which seems to manifest when using sudo to run an executable that is absent
* increasing check time for # activeTTs from 100s to 150s
* removing "-x" option from bash scripts so that vhm.log is not clutterred