Removed line breaks inside paragraphs (but diffs, which are line-based in SourceTree, become much less usable)
taking a snapshot … before hacking to figure out RST error
ironed out RST bug:  :label: cannot contain "_" underscore!! … the tool chain is very painful to debug :-(
Almost ready for EuroSciPy, after some final proof reading.
Pre-final version: before Kelsey's proof reading
Final proof-read version, ready for EuroSciPy Proceedings