Another overhaul of the R-C extraction code. This fixes a known

long-standing problem, in which the resistance extraction attempts
to determine the device type of each device.  Which is stupid,
because the original extraction process has already done this, and
the information is readily available in the .ext file.  This update
allows "extresist" to get all the device information from the .ext
file, so there is no guesswork and no extra time spent trying.
Unfortunately, it does not solve the problem I expected it to solve,
which is the disappearance of _dss and moscap devices from gf180mcu
netlists.  More work to do. . .

resis/resis.h

@@ -549,6 +549,7 @@ extern int	      		ResExtCombineParallel();
 extern int 			dbSrConnectStartFunc();
 extern int			ResEach();
 extern int			ResAddPlumbing();
+extern void			ResAddDevPlumbing();
 extern int			ResRemovePlumbing();
 extern float			ResCalculateChildCapacitance();
 extern ResDevTile		*DBTreeCopyConnectDCS();