Corrected an issue where a device was given the wrong type due to

ambiguity in the tech file and therefore also in the .ext file.
This is easy to resolve and it was only necessary to change the
type after finding the tile belonging to the device.  There are
pathological cases where this might still go wrong, like defining
a "short" device name for metal resistors on any plane;  then,
if a "short" device overlaps something on another plane, it might
be given the wrong type.  Avoiding all ambiguity would require
adding an extra item to "device" lines in the .ext file output;
the short plane name would be most efficient.

extract/ExtBasic.c

@@ -821,8 +821,14 @@ extOutputNodes(nodeList, outFile)
 				 * For a net to be shorted to itself is not an error.
 				 * NOTE:  Potentially the unique name could be removed
 				 * here and save ext2spice the trouble.
+				 *
+				 * Also:  If "extresist" is being run in the same
+				 * pass, then don't print an error, because
+				 * electrical shorts are meaningless in an R-C
+				 * extraction.
 				 */
 				if ((portname != NULL) &&
+					    (!(ExtOptions & EXT_DORESISTANCE)) &&
 			    		    (ll->ll_attr == LL_PORTATTR) &&
 					    (strcmp(ll->ll_label->lab_text, portname)))
 				{

resis/ResMain.c

@@ -1371,7 +1371,7 @@ ResExtractNet(node, resisdata, cellname)
 	     * the reason, rewrite the tptr->thisDev and local thisDev records
 	     * to match the actual device at the location.
 	     */
-	    thisDev->type = tptr->thisDev->rs_ttype;
+	    tptr->thisDev->rs_ttype = thisDev->type;
 	    for (devptr = ExtCurStyle->exts_device[thisDev->type]; devptr;
 				devptr = devptr->exts_next)
 	    {

resis/ResUtils.c

@@ -465,6 +465,12 @@ ResAddDevPlumbing(
 
     tile = PlaneGetHint(plane);
     GOTOPOINT(tile, &(thisDev->area.r_ll));
+    if (TiGetTypeExact(tile) == TT_SPACE)
+    {
+	TxError("Bad device location at (%d %d).  There is nothing here.\n",
+			thisDev->area.r_ll.p_x, thisDev->area.r_ll.p_y);
+	return;
+    }
     PlaneSetHint(plane, tile);
 
     if (IsSplit(tile))