* Change the `disapproval:<reason>` metatag to `disapproved:<reason>`.
* Change `disapproved:<reason>` to show all posts disapproved for a
given reason, not just those disapproved by the current user.
* Allow searching for your own disapprovals with `disapproved:<my_name>`.
* Drop the `disapproved:<any|none>` metatags. `disapproved:any` is
equivalent to `disapproved:<my_name>` and `disapproved:none` is
equivalent to `-disapproved:<my_name>`.
These changes are so that you can search e.g. disapproved:poor_quality
to find all posts disapproved for poor quality.
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