Checking in IDLE 0.2.

Much has changed -- too much, in fact, to write down.
The big news is that there's a standard way to write IDLE extensions;
see extend.txt.  Some sample extensions have been provided, and
some existing code has been converted to extensions.  Probably the
biggest new user feature is a new search dialog with more options,
search and replace, and even search in files (grep).

This is exactly as downloaded from my laptop after returning
from the holidays -- it hasn't even been tested on Unix yet.

Tools/idle/idle.pyw

@@ -1,3 +1,9 @@
-#! /usr/bin/env python
-import PyShell
-PyShell.main()
+try:
+    import PyShell
+    PyShell.main()
+except SystemExit:
+    raise
+except:
+    import traceback
+    traceback.print_exc()
+    raw_input("Hit return to exit...")