evazion be27423afd search: fix invalid username searches returning wrong results. ...

Partial fix for #4389.

* Fix invalid username searches returning all posts instead of no posts.
* Fix "user:A user:B" returning results for user:B instead of no results.
* Fix "approver:A approver:B" returning results for approver:B instead of no results.
* Add support for negated -commenter, -noter, -noteupdater, -upvote, -downvote metatags.
* Add support for "any" and "none" values for all username metatags,
  including negated metatags that didn't support "any" or "none" before.
* Change noter:any and commenter:any to include posts with deleted notes
  or comments. Note that commenter:<username> already included deleted
  comments before. This is so that commenter:any has the same behavior
  as commenter:<username>

2020-04-15 01:18:41 -05:00

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