[darcs-users] darcs patch: fix warnings

[Ganesh Sittampalam]

This patch fixes the warnings introduced by the darcs-hs merge,
with the exception of a supposedly unused import in Darcs.Diff
which I think is caused by a GHC bug (it's notorious for spurious
warnings of this nature).

Thu Oct  8 23:32:15 BST 2009  Ganesh Sittampalam <ganesh at earth.li>
  * fix warnings

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