* Fix search method for search tokens spread across fields
Addresses GH #3636, which reports that if you're searching for "test
body", and "test" only appears in the title field, and "body" only appears
in the text field, 5.1.18's search method won't yield that tiddler as a
result, which appears to be a regression from the 5.1.17 behavior
* Add test for searching for multiple tokens across fields
Verifies GH #3636:
> If I create a tiddler in the empty edition with the title "Test tiddler" and content "Body content", searching the wiki for "test body" yields no results under either "title matches" or "all matches". Searching for either word individually turns up "Test tiddler", and repeating this in an empty wiki I created from the 5.1.17 tag causes "Test tiddler" to show up under "all matches".
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