Commit of a *MAJOR* patch from Dan McGuirk <djm@indirect.com>

Changes:

        * Unique index capability works using the syntax 'create unique
          index'.

        * Duplicate OID's in the system tables are removed.  I put
          little scripts called 'duplicate_oids' and 'find_oid' in
          include/catalog that help to find and remove duplicate OID's.
          I also moved 'unused_oids' from backend/catalog to
          include/catalog, since it has to be in the same directory
          as the include files in order to work.

        * The backend tries converting the name of a function or aggregate
          to all lowercase if the original name given doesn't work (mostly
          for compatibility with ODBC).

        * You can 'SELECT NULL' to your heart's content.

        * I put my _bt_updateitem fix in instead, which uses
          _bt_insertonpg so that even if the new key is so big that
          the page has to be split, everything still works.

        * All literal references to system catalog OID's have been
          replaced with references to define'd constants from the catalog
          header files.

        * I added a couple of node copy functions.  I think this was a
          preliminary attempt to get rules to work.

src/backend/bootstrap/bootparse.y

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/bootstrap/bootparse.y,v 1.3 1996/10/21 08:31:18 scrappy Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/bootstrap/bootparse.y,v 1.4 1996/11/13 20:47:45 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -231,7 +231,7 @@ DeclareIndexStmt:
 		  DefineIndex(LexIDStr($5), 
 			      LexIDStr($3), 
 			      LexIDStr($7),
-			      params, NIL, 0, NIL);
+			      params, NIL, 0, 0, NIL);
 		  DO_END;
 		}
 	;