Correct undefined-property error.
Correct constant.
AssignmentSet: Rely less on globals.

Pass in the relevant contact and time.
Review tokens: Use explicit activation rather than implicit $_SESSION.

Like the way we do capabilities now. Easier to test.
Recover 'no matching papers' message.
Correct boner.
Rights machinery now requires Paper::outcome.
PaperStatus submit procedure correctly updates `papersub` setting.
Review::saveRequest: Use an explicit Contact argument.

genericWatch also.
Clear deadline cache when saving a setting.

Usability.
Correct logic for when a review is "counted" rather than "viewed".

Viewing reviewer identity is "counting" the review, because often PC
members can view reviewer identities before the review is completed.
Hope this is right!
Tests: Add review assignments, more substantive review search tests.
Remove unused.