Adding tests for cabal-install

[Mikhail Glushenkov]

Hi all,

I'm currently looking into #1159, and I'd really like to add some unit
tests for the UserConstraints parser. The problem is that I can't
access modules defined under Distribution.Client.* without doing
unnecessary recompilation. Would it be fine if I split cabal-install
into library and executable parts in the following fashion:

Library cabal-install
  Build-depends:  ...
  ...

Executable cabal-install
  Main-is: Main.hs
  Build-depends: cabal-install == N.N, ...
  ...

Test-suite unit-tests
  Build-depends: cabal-install == N.N, ...
  ...

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