comment on operator / schema

Rod Taylor <rbt@zort.ca> writes:

Changed operator comments to use pg_operator for the classid.
Changed psql to coalesce(operator comment, procedure comment) for
display of the Description field during \do
Created a comment on schema command.

Reviewed and applied. For future reference, you missed out updating
pg_dump and the documentation; also psql's \dd command needed changes.

regards, tom lane