A wiki page for managing the 6.10 handover

[Don Stewart]

http://haskell.org/haskellwiki/Upgrading_packages#Typical_breakages_with_GHC_6.10

It collects the 7 or so known issues that break code with GHC 6.10.
Please feel free to clean up, and especially *add techniques for
handling each change*.

If we do this right, with cabal-install being smart, clear summaries of
what is broken and how to fix it, this might be the smoothest major
release yet.

-- Don