Proposal: Add default instances for Functor and Applicative

[Malcolm Wallace]

Please remember that the base library is supposed to be shared between all Haskell compilers; it is not ghc-only.  If the proposal relies on an extension of the Haskell'2010 language, then your proposal must also provide equivalent functionality for all compilers that do not implement the extension (for example, selected by CPP conditional sections).

Regards,
    Malcolm