[xmonad] XMonad.Config.Prime, a monadic config syntax

[Devin Mullins]

Hello, folks. Loooong time no see. I had some free time and spare energy this
weekend, and this one had always been curiousing me. A couple things:

1. I `darcs rec`d with --no-test, since Minimize was complaining about a
shadowed identifier.

2. This adds new build deps on fclabels and template-haskell. I know y'all are
generally fairly conservative on new deps. What do you think?

3. Here's a live copy of the haddock doc:
http://twifkak.com/xmonad-junk/XMonad-Config-Prime.html

Sun Sep 23 22:57:31 PDT 2012  Devin Mullins <me at twifkak.com>
  * XMonad.Config.Prime, a monadic config syntax
  This is an attempt at a cleaner and more modular config syntax, a follow up to
  http://thread.gmane.org/gmane.comp.lang.haskell.xmonad/5398. (Hello, everybody!
  How have the last four years been?)
  
  FAQ:
  
  Why fclabels instead of data-lens?
  Of the two, it was the one that successfully compiled on my ancient Ubuntu
  Lucid machine when I ran `cabal install`.
  
  Ick, template-haskell? Really?
  Yeah, I know. Unfortunately, it seems that GHC won't let me write:
  > data L = forall l. L l
  > g f (L l) = L (f l)
  so I can't really make a generic Layout transformer. I spent a few minutes
  heading down the path of parameterized monads and NoImplicitPrelude, but the
  type-system mind games and the juggling between (Prelude.>>) for IO and
  (Control.Monad.Parameterized.>>) for state were melting my brain.

Sun Sep 23 23:20:20 PDT 2012  Devin Mullins <me at twifkak.com>
  * minor tweaks to X.C.Prime

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