Some fixes and enhancements to the two helper scripts change_gds_string.py
and find_gds_prefix.py.  The latter script is probably useless because
running the Linux "strings" command is much faster.  The former script
can now be used with multiple string-replacement pairs in one pass, and
has the option "-verbatim" to look for exact string matches only, rather
than the usual partial string match that comes from using regsub or
the string "replace" method in python.
diff --git a/Makefile.in b/Makefile.in
index cb4286b..06bb94a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -87,6 +87,9 @@
 		mkdir -p @prefix@/pdk/bin/ ;\
 		cp common/cleanup_unref.py @prefix@/pdk/bin/ ;\
 		cp common/soc_floorplanner.py @prefix@/pdk/bin/ ;\
+		cp common/change_gds_cell.py @prefix@/pdk/bin/ ;\
+		cp common/find_gds_prefix.py @prefix@/pdk/bin/ ;\
+		cp common/change_gds_string.py @prefix@/pdk/bin/ ;\
 		${CPP} -DPREFIX=@prefix@ common/create_project.py \
 			@prefix@/pdk/bin/create_project.py ;\
 		echo "Common install:  Done." ;\