Modified the techfile to make use of a techfile extension added to
magic that allows the paint/erase lines in "compose" to declare
multiple types to be painted.  This allows the "obslic" contact to
be erased if painted over with obsm1 without erasing obsli underneath.
diff --git a/.gitignore b/.gitignore
index 77cb82d..3fb76ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,7 @@
 !scripts/configure.ac
 **/Makefile
 **/Makefile.am
+
+# staged PDKs
+sky130/sky130A
+sky130/sky130A/*