pgsql: Add the long options to the psql --help display, where they were

Log Message:
-----------
Add the long options to the psql --help display, where they were curiously
missing.

Since this touches most lines of the help output, also change the mix of
puts and printf calls to printf everywhere, for easier code editing and
reviewing.

Modified Files:
--------------
    pgsql/src/bin/psql:
        help.c (r1.140 -> r1.141)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/help.c?r1=1.140&r2=1.141)