Have text search thesaurus files use "?" for stop words.

Bruce Momjian <bruce@momjian.us>

Commit: d009992ba37ea51f6c4a6ab0bce4c21ddc0abe9b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2007-11-10T15:39:34Z
Releases: 8.3.0
Have text search thesaurus files use "?" for stop words.

Throw an error for actual stop words, rather than a warning.  This fixes
problems with cache reloading causing warning messages.

Re-enable stop words in regression tests;  was disabled by Tom.

Document "?" as API change.

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