comments on columns aren't displayed by \dd

Stephen van Egmond (svanegmond@home.com) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
comments on columns aren't displayed by \dd

Long Description
Comments on columns appear to be broken.  CREATE COMMENT ON COLUMN inserts stuff into the backend pg_* tables
correctly. However \dd from the psql interactive monitor doesn't send a query to retrieve it (i.e. no join on
pg_attribute).

I am working from the Debian package postgresql-client 7.0.3-2.

Sample Code
create table foo (a text);
cmment on column foo.a is 'hello!';
\dd foo.a

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