Bring README up to date, bring CI back to old glory #145
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As a first step in addressing issue #138 , it's fairly simple to bring the README up to date.
Many small details about how to build, run, etc are changed. Very out-of-date info is purged, and notes are made that the manual still needs updating (work in progress...).
While doing so, I realised the old README referred to a version matrix CI used to use, so I re-implemented that in the Github CI action with what I believe are currently reasonable versions. Now, that part of the README will be correct again.