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

Tools/demo/beer.py

@@ -0,0 +1,20 @@
+#! /usr/bin/env python3
+
+# By GvR, demystified after a version by Fredrik Lundh.
+
+import sys
+
+n = 100
+if sys.argv[1:]:
+    n = int(sys.argv[1])
+
+def bottle(n):
+    if n == 0: return "no more bottles of beer"
+    if n == 1: return "one bottle of beer"
+    return str(n) + " bottles of beer"
+
+for i in range(n, 0, -1):
+    print(bottle(i), "on the wall,")
+    print(bottle(i) + ".")
+    print("Take one down, pass it around,")
+    print(bottle(i-1), "on the wall.")