patch applied (ghc): Figure out where the rest of the repositories are, based on defaultrepo

[Simon Marlow]

Fri Oct  6 03:00:49 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * Figure out where the rest of the repositories are, based on defaultrepo
  This is a slight improvement over the patch sent by jamey at minilop.net,
  we now do it properly if the source repo was a GHC tree on the local
  filesystem too.
  
  Merge post 6.6.

    M ./darcs-all -2 +9