Make incategory: and intitle: negatable

-incategory: and -intitle: negate incategory: and not-incategory:
respectively.

Rework the tests for these filters as well.  Move them to their own file
because there are a bunch of them.  Give them a tag.  Break them into a
a bunch of scenarios so they each get their own name.

Bug: 56788

Change-Id: Ie3d338a5335e590016112936b106bb11083b265b
Merge "Make incategory: and intitle: negatable"