pgsql: Please find attached diffs for documentation and simple

Log Message:
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Please find attached diffs for documentation and simple regression
tests for the new interval->day changes. I added tests for
justify_hours() and justify_days() to interval.sql, as they take
interval input and produce interval output. If there's a more
appropriate place for them, please let me know.

Michael Glaesemann

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.273 -> r1.274)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.273&r2=1.274)
    pgsql/src/test/regress/expected:
        horology.out (r1.56 -> r1.57)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/horology.out.diff?r1=1.56&r2=1.57)
        interval.out (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/interval.out.diff?r1=1.12&r2=1.13)
    pgsql/src/test/regress/sql:
        horology.sql (r1.30 -> r1.31)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/horology.sql.diff?r1=1.30&r2=1.31)
        interval.sql (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/interval.sql.diff?r1=1.7&r2=1.8)