Attached patch implements an editor for pgpass.conf/.pgpass modeled on
the HBA editor. In doing so it also:
* Adds the ability to delete a row to the pg_hba editor
* Moves the "get the name of the password file" to pgSettings so it can
be shared. Sets up a tiny bit of infrastructure for when there may be
more config files.
Trying a .zip this time so it doesn't get eaten by the list filter.
//Ma <<Config_editors.zip>> gnus