pgsql: Add information_schema.triggered_update_columns This reflects

Log Message:
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Add information_schema.triggered_update_columns

This reflects the recently added support for triggers on columns.

Modified Files:
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    pgsql/doc/src/sgml:
        information_schema.sgml (r1.43 -> r1.44)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/information_schema.sgml?r1=1.43&r2=1.44)
    pgsql/src/backend/catalog:
        information_schema.sql (r1.61 -> r1.62)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/information_schema.sql?r1=1.61&r2=1.62)