[xmonad] darcs patch: Applicative instance for X; new startupHook

[Don Stewart]

byorgey:
>    On Sun, Feb 24, 2008 at 2:17 PM, Don Stewart <[1]dons at galois.com> wrote:
> 
>      This looks good. How does the startuphook differ from running code in
>      main? It's easier for extensions to register hooks?
> 
>    Well, the main reason is that this way, the startupHook can be run in the
>    X monad, AFTER xmonad has initialized all its state and so forth.  Running
>    code in main would only be able to run in IO.

Ah yes, good point. This is in now. Did you have contrib patches to
follow?