psql \lo_* quiet mode patch

I sent this in a while back, but never heard anything about it.

This patch makes psql's \lo_* commands respect the -q flag (or other
methods of setting quiet mode) as well as HTML output mode. This came in
very handy when writing a regression test which uses the \lo_import
command since it would otherwise output the OID of the new large object
which would be different every run.

Please let me know if it is ok, or if I need to do it differently.

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