Make Rank2Types and PolymorphicComponents into a synonym for RankNTypes (no deprecation)
There was a long thread on cvs-ghc which concluded that although it's the Right Thing to deprecate Rank2Types and PolymorphicComponents, in favour of RankNTypes, it would cause lots of busy-work for library authors and the pain isn't worth the gain. So this patch removes the deprecation, and documents the synonym-ity.
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