Moved sort_pdkfiles.py to common/, and modified behavior to always use the
default sort (which is a natural sort), given that doing "glob.glob" on a
file directory results in a pretty arbitrary and meaningless ordering.
diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 88ad096..9525d38 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -73,7 +73,7 @@
# This Makefile contains bash-isms
SHELL = bash
-REVISION = 20200508
+REVISION = 20200927
TECH = sky130
# If EF_STYLE is set to 1, then efabless naming conventions are