Add extra line to DQ summary table for unknown appointment status

[francisbarton]

Closes issue #77

[StatsRhian]

The diff seems to be showing national data deleted?

Otherwise all good

[francisbarton]

The new file is 667KB and the previous one was 671KB, so the -3KB thing is right, the 100% must just be because it's binary and github can't/doesn't actually work out how much of the file is changed.

That's really strange. The file is definitely there, with the correct data. I re-ran the export locally and the new .rda isn't showing as a new change in git, so should be the same as what's already pushed here.
I'm going to try another commit and see if it triggers anything!