Add system catalog columns pg_constraint.conindid and pg_trigger.tgconstrindid.

conindid is the index supporting a constraint.  We can use this not only for
unique/primary-key constraints, but also foreign-key constraints, which
depend on the unique index that constrains the referenced columns.
tgconstrindid is just copied from the constraint's conindid field, or is
zero for triggers not associated with constraints.

This is mainly intended as infrastructure for upcoming patches, but it has
some virtue in itself, since it exposes a relationship that you formerly
had to grovel in pg_depend to determine.  I simplified one information_schema
view accordingly.  (There is a pg_dump query that could also use conindid,
but I left it alone because it wasn't clear it'd get any faster.)

src/include/utils/rel.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.114 2009/06/11 14:49:13 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.115 2009/07/28 02:56:31 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -58,6 +58,7 @@ typedef struct Trigger
 	char		tgenabled;
 	bool		tgisconstraint;
 	Oid			tgconstrrelid;
+	Oid			tgconstrindid;
 	Oid			tgconstraint;
 	bool		tgdeferrable;
 	bool		tginitdeferred;