I have modifed heap.c so that it won't automatically generate duplicate

I have modifed heap.c so that it won't automatically generate duplicate
constraint names.

> > A reasonable interpretation of DROP CONSTRAINT "foo" is to drop *all*
> > constraints named "foo" on the target table.
>
> Then it should probably be a good thing to avoid the automatic
> generation of
> duplicate names?  I might take a look at that, actually...
>

Christopher Kings-Lynne