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/spectre_to_spice.py b/common/spectre_to_spice.py
index 2a1ff64..4243a1a 100755
--- a/common/spectre_to_spice.py
+++ b/common/spectre_to_spice.py
@@ -1,4 +1,4 @@
-#!/bin/env python3
+#!/usr/bin/env python3
 # Script to read all files in a directory of SPECTRE-compatible device model
 # files, and convert them to a form that is compatible with ngspice.