[PATCH] Make "psql -1 < file.sql" work as with "-f"

Dear PostgreSQL developers,

Plese find attached a patch so that:

     Make "psql -1 < file.sql" work as with "-f"

     Make psql --single-transaction option work on a non-interactive
     standard input as well, so that "psql -1 < input.sql" behaves as
     "psql -1 -f input.sql".

This saner/less error-prone behavior was discussed in this thread back in 
June:

 	http://archives.postgresql.org/pgsql-hackers/2012-06/msg00785.php

I have tested it manually and it works for me. I'm not sure this is the 
best possible implementation, but it is a small diff one. I haven't found 
a place in the regression tests where "psql" could be tested with 
different options. Did I miss something?

-- 
Fabien.