Support temporary setting of search path during CREATE SCHEMA; this

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

Commit: 940f772a292124cb4506ffd7c9c2e953f9db3f33
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-05-17T20:53:33Z
Releases: 7.3.1
Support temporary setting of search path during CREATE SCHEMA; this
allows the example in the CREATE SCHEMA ref page to actually work now.
Also, clean up when the transaction that initially creates a temp-table
namespace is later aborted.  Simplify internal representation of search
path by folding special cases into the main list.

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