Dlaydon/add quarantined not sick

[dlaydon]

Hi @matt-gretton-dann, I've added a couple of variables to the .severity.xls outputs, which will cause regression tests to fail. Otherwise output identical. Are you able to regenerate the target files then merge? Cheers!

[weshinsley]

@dlaydon While you're doing this, I wonder whether it's worth looking at #381 (noting that that fix would change previous numbers in the results, although not in any "scientifically concerning" way)