Cabal and simultaneous installations of the same package

[Vishal Agrawal]

I am already planning to do a GSoC project based on it with a slightly
larger aim. You can find my work in progress proposal at
https://gist.github.com/fugyk/37510958b52589737274. Also I have written a
patch to make cabal non-destructive at
https://github.com/fugyk/cabal/commit/45ec5edbaada1fd063c67d6109e69efa0e732e6a.
Can you review the proposal and give me suggestions.
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