Modified a number of scripts using "/bin/env" to make it
"/usr/bin/env", since the "/bin" location does not exist on some
versions of Linux.
diff --git a/common/change_gds_string.py b/common/change_gds_string.py
index b8a0321..accbc50 100755
--- a/common/change_gds_string.py
+++ b/common/change_gds_string.py
@@ -1,4 +1,4 @@
-#!/bin/env python3
+#!/usr/bin/env python3
# Script to read a GDS file, modify the given string, and rewrite the GDS file.
# The string may be a substring; the GDS file will be parsed completely for
# library name, structure name, instance name, and other strings, and the
