Code review comment for lp:~jontai/openvista-gtm-integration/bug370652

This merge request supercedes https://code.launchpad.net/~joel-sher/openvista-gtm-integration/bug370652/+merge/6483 I merged Joel's branch into the branch presented here and did some additional work on the routines. I also ignored Joel's update to ZCD when I merged his branch - that update belongs on a different branch.