Galaxy Training Materials & Tool versions

Background: We had some users testing training materials on the AU server. They reported issues - it turns out, the AU servers didn't have all the same tool versions (in fact, theirs were newer), so the GTN tutorial was defaulting to the closest one.

Why is this a problem?: How do we keep all servers allegedly supporting GTN materials to a) have the tools; b) have the right tool versions; and c) if either a or b are messed up, communicate this to a user?

If we didn't manually check and be live able to deal with this and tell the user/would-be-contributor the issue, this would have frustrated a user and they would likely not have come back.

We *need* to synchronise tools & versions across subdomains / servers, and if those tools are NOT available/working, this needs signposting to a user better.