Fix tsvectorout() and tsqueryout() to escape backslesh, add test of that.

Teodor Sigaev <teodor@sigaev.ru>

Commit: a867b40cf45fa564810fedf892fcfbcae46a2009
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2007-11-16T15:05:59Z
Releases: 8.3.0
Fix tsvectorout() and tsqueryout() to escape backslesh, add test of that.
Patch by Bruce Momjian <bruce@momjian.us>

Backpatch is needed, but it's impossible to apply it directly

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