Improve documentation about MULE encoding.

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

Commit: 09022de1f55708bcfe8b2bf206d818055c34d49e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2012-07-04T04:29:57Z
Releases: 9.3.0
Improve documentation about MULE encoding.

This commit improves the comments in pg_wchar.h and creates #define symbols
for some formerly hard-coded values.  No substantive code changes.

Tatsuo Ishii and Tom Lane

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