Added a footer

Resolves #648.
Resolves #714.
Apparently somehow resolves #1217, although I suspect the real issue was actually fixed in some earlier pull and we just never tried it until now.

http://jenkins.buttonweavers.com:8080/job/buttonmen-AdmiralJota/420/

Dependent on #1199.

As for things mentioned in the original ticket, this provides "webmaster / contact details", "link to issue tracker" and "copyright". We have other open tickets that are relevant to "support / FAQs" (#137) and "legal disclaimers and privacy policy" (#551). I'm not sure how we want to approach implementing "deployment date / time / version"; I'll leave it up to someone else ti create a separate ticket for that if we want to include it.
arrangePage() used to put down the status message first.  Now it does it last.  Why?

I thought the purpose of the status message was to communicate from the past to the present about something the player did.  But your comment says "from a *current* or previous invocation".  Did this change?