add scope=col or row to appendix table #420
Merged
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As recommended by
https://www.w3.org/WAI/tutorials/tables/two-headers/
http://webaim.org/techniques/tables/data
Prompted by @phanimahesh comment I searched for info on table accessibility and found above recommendations. I didn't find anything on empty table cells other than to not use them to obtain borders or spacing, which we don't.
Further accessibility issues and pull requests would be most welcome.