Harmonize docstrings.  Move redemo from Tools/scripts to Tools/demo.  Add a README file to Tools/demo.
diff --git a/Tools/demo/ss1.py b/Tools/demo/ss1.py
old mode 100644
new mode 100755
index 8b07489..2d1e490
--- a/Tools/demo/ss1.py
+++ b/Tools/demo/ss1.py
@@ -1,4 +1,8 @@
-"""SS1 -- a spreadsheet."""
+#!/usr/bin/env python3
+
+"""
+SS1 -- a spreadsheet-like application.
+"""
 
 import os
 import re