Implement a solution to the 'Turkish locale downcases I incorrectly'

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

Commit: 8c99671a3b2e5b90d263cfd883c9cdeba63d6cc4
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-02-21T00:35:13Z
Releases: 7.4.2
Implement a solution to the 'Turkish locale downcases I incorrectly'
problem, per previous discussion.  Make some additional changes to
centralize the knowledge of just how identifier downcasing is done,
in hopes of simplifying any future tweaking in this area.

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