build-dep command

[Ian Lynagh]

Hi all,

This patch adds a build-dep command to cabal-install, so
    cabal-install build-dep mypackage
installs all the dependencies of mypackage, but not mypackage itself.

There are at least a couple of problems with this patch:
* I don't know what happens if you say
      cabal-install build-dep foo bar
  and bar is one of the transitive dependencies of foo.
* Removing the packages from the install plan should probably do so
  directly, rather than converting the plan to a list and back again.

But I'm sending it now so it doesn't just sit on my HD for eternity.


Thanks
Ian

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