Make a cleanup pass over error reports in tsearch code. Use ereport

Tom Lane <tgl@sss.pgh.pa.us>

Commit: bb0e3011f8670cefc7b4ef667d890c9adb7556db
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-11-28T21:56:30Z
Releases: 8.3.0
Make a cleanup pass over error reports in tsearch code.  Use ereport
for user-facing errors, fix some poor choices of errcode, adhere to
message style guide.

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