Correct bug with negated round: search.
Nits
Search 'any', get all papers.

But this is only if you search for 'any' bare. If you search for a string, such as
'any of my money', then 'any' is treated as a normal word. As usual, quotes
work too.
Allow upload of twiddle tags.
If bulk assignment has nothing to do, report nothing done.
Add cleartag action.
CSV: If line ends with trailing comma, save next field as empty string.
'clearreview' can remove all reviews with a given round.