Haskell Platform Proposal: add transformers and revise the mtl package to depend on it

[Johan Tibell]

Ross,

Could you please add an "Open Issues" section where you keep track on any
open issues/objections raised so far (a short summary is enough), to make
sure that we deal with them all and to avoid them being rehashed. For
example:

Open Issues
=========

1. Performance monads when defined in terms of monad transformers.

To ensure that defining the base monads in terms of their monad transformer
version over the Identity monad the following benchmarks were run:

<some benchmarks>

These benchmarks show no performance difference.

2. More complicated type signatures due to using a monad transformer to
define base monads.

<etc>

By documenting these decisions we can preempt needless rehashing of
arguments and capture the consensus on these issues.

Thanks!

-- Johan
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