pgsql: Remove the long-deprecated -u option from psql, since it does

Log Message:
-----------
Remove the long-deprecated -u option from psql, since it does nothing very
useful and confuses people who think it is the same as -U.  (Eventually
we might want to re-introduce it as being an alias for -U, but that should
not happen until the switch has actually not been there for a few releases.)
Likewise in pg_dump and pg_restore.  Per gripe from Robert Treat and
subsequent discussion.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        psql-ref.sgml (r1.196 -> r1.197)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml?r1=1.196&r2=1.197)
    pgsql/src/bin/pg_dump:
        pg_dump.c (r1.479 -> r1.480)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c?r1=1.479&r2=1.480)
        pg_restore.c (r1.84 -> r1.85)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_restore.c?r1=1.84&r2=1.85)
    pgsql/src/bin/psql:
        command.c (r1.184 -> r1.185)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/command.c?r1=1.184&r2=1.185)
        startup.c (r1.143 -> r1.144)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/startup.c?r1=1.143&r2=1.144)