Remove sequence diagram stuff
Mark George committed on 9 May 2019
Just realised you can combine [hidden] and [norank] with directions.
Mark George committed on 12 Mar 2018
Mark committed on 6 Mar 2017
Removed SVG and fiddled with code listings, since the GitBucket markdown renderer is a bit crap.
Mark George committed on 4 Feb 2016
Mark committed on 4 Feb 2016