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Disambiguate MonadPlus

Reform the MonadPlus class along these lines:

class Monad m => MonadZero m where
   mzero :: m a
class MonadZero m => MonadPlus m where
   mplus :: m a -> m a -> m a
class MonadZero m => MonadOr m where
   morelse :: m a -> m a -> m a

http://haskell.org/haskellwiki/MonadPlus_reform_proposal

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Component HaskellPrime
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