Rename pg_regress option --multibyte to --encoding

Peter Eisentraut <peter_e@gmx.net>

Commit: f536d4194293f900577c728bfa4e62075a4c7da0
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2011-04-15T05:42:05Z
Releases: 9.1.0
Rename pg_regress option --multibyte to --encoding

Also refactor things a little bit so that the same methods for setting
test locale and encoding can be used everywhere.

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