Add a tab under manufacturers to filter out all SSTU parts.

Apparently this will require investigation of the 'agents' folder/config node setup. Should likely be fairly easy to accommodate, but will require some time (while not at work) to sit down and work through the stuff.

Scheduling for this weeks update, but may or may not actually make it in depending upon other demands for my time / how the rest of the week goes.

No hurry on this, just cool for future versions.