Log Message:
-----------
Fix wrong week returnded by date_trunc('week') for early dates in
January --- would return wrong year for 2005-01-01 and 2006-01-01.

per report from Robert Creager.

Backpatch to 8.0.X.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.243 -> r1.244)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.243&r2=1.244)
    pgsql/src/backend/utils/adt:
        timestamp.c (r1.117 -> r1.118)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.117&r2=1.118)

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