different flavours of Monad Template Library

[Ross Paterson]

I have uploaded these to hackage.  The packages are:

transformers: monad transformers, operations and liftings.
	This is all Haskell 98, and be used on its own, or as a base
	for packages defining monad classes.

monads-fd: monad classes using functional dependencies, with instances
	for the transformers in the transformers package.  This is
	mostly backwards-compatible with mtl.

monads-tf: monad classes using type families, with instances for the
	transformers in the transformers package.  This is mostly
	backwards-compatible with mtl-tf.