More cleanup: Move some demos into a dedicated Tools/demo dir, move 2to3 demo to Tools, and remove all the other Demo content.

Tools/test2to3/maintest.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python3
+
+# The above line should get replaced with the path to the Python
+# interpreter; the block below should get 2to3-converted.
+
+try:
+    from test2to3.hello import hello
+except ImportError, e:
+    print "Import failed", e
+hello()