[xmonad] the new documentation system

[Andrea Rossato]

Hi,

an update.

- XMnad.Util.*, XMonad.Prompt.* and XMonad.Layout.* are done.
  XMonad.Config.* are just example and I will not touch them but mine.

- XMonad.Doc and XMonad.Doc.Configuring are (almost) done

What is left:

1. XMonad.Doc.Extending: manageHook and logHook.

2. XMonad.Doc.Developing: everything but I have clear ideas on this
   document.

3. XMonad.Action.*: many are still to be done;

4. XMonad.Hooks.*: I'll do them tonight.

That's it.

Andrea