pgsql: Fix to_number for the case of a trailing S.

Log Message:
-----------
Fix to_number for the case of a trailing S.
Karel Zak

Modified Files:
--------------
pgsql/src/backend/utils/adt:
formatting.c (r1.79 -> r1.80)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/formatting.c.diff?r1=1.79&r2=1.80)
pgsql/src/test/regress/expected:
numeric.out (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/numeric.out.diff?r1=1.15&r2=1.16)
pgsql/src/test/regress/sql:
numeric.sql (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/numeric.sql.diff?r1=1.10&r2=1.11)