Thread: pgsql: New features contributed by Tomoaki Sato.

Log Message:
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New features contributed by Tomoaki Sato.

- predefined variable "tps"
  The value of variable tps is taken from the scaling factor
  specified by -s option.

- -D option
  Variable values can be defined by -D option.

- \set command now allows arithmetic calculations.

Modified Files:
--------------
    pgsql/contrib/pgbench:
        README.pgbench (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgbench/README.pgbench.diff?r1=1.12&r2=1.13)
        README.pgbench_jis (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgbench/README.pgbench_jis.diff?r1=1.13&r2=1.14)
        pgbench.c (r1.49 -> r1.50)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgbench/pgbench.c.diff?r1=1.49&r2=1.50)