Beginning of a Python reimplementation of tracediff script.
diff --git a/scripts/snapdiff.py b/scripts/snapdiff.py
index 0e40419..6a31650 100755
--- a/scripts/snapdiff.py
+++ b/scripts/snapdiff.py
@@ -26,6 +26,10 @@
 ##########################################################################/
 
 
+'''Snapshot (image) comparison script.
+'''
+
+
 import sys
 import os.path
 import optparse