Log Message:
-----------
Bring some order and sanity to error handling in the xml patch.
Use a TRY block instead of (inadequate) ad-hoc coding to ensure that
libxml is cleaned up after a failure.  Report the intended SQLCODE
instead of defaulting to XX000.  Avoid risking use of a dangling
pointer by keeping the persistent error buffer in TopMemoryContext.
Be less trusting that error messages don't contain %.

This patch doesn't do anything about changing the way the messages
are put together --- this is just about mechanism.

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        xml.c (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/xml.c.diff?r1=1.4&r2=1.5)

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