Add Unix main script and test program.

Tools/idle/idle

+#! /usr/bin/env python
+import PyShell
+PyShell.main()

Tools/idle/test.py

+
+def f(): a = b = c = d = e = 0; g()
+
+def g(): h()
+
+def h(): i()
+
+def i(): j()
+
+def j(): k()
+
+def k(): l()
+
+l = lambda: test()
+
+def test():
+    exec "import string; string.capwords(None)" in {}
+
+k()