Log Message:
-----------
Add summarization comment about visibility functions.

Add URL about the Halloween problem.

Modified Files:
--------------
    pgsql/src/backend/utils/time:
        tqual.c (r1.111 -> r1.112)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/time/tqual.c?r1=1.111&r2=1.112)

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