p5-dbd-pg

Hey there,

On doing a routine pkg upgrade at the dayjob, the perl module p5-DBD-pg forced an upgrade from postgresql12-client to postgresql13-client (which uninstalled postgresql12-server).  This in turn required a full dump and restore of the DB to make things compatible (after first re-downgrading to postgresql12-server).

(Also, pgtop was removed, even though it should work perfectly well with postgres12).

This feels like the ideal kind of port that could be flavored so it works with any installed postgres version.  I'm willing to submit patches, how hard would it be?  Is there a section in the porter's handbook that covers this?

-Dan