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Since it exactly matches what the previous condition parser did.
So we have two different ways of parsing Bool depending on
context. Sigh. Both match exactly what was done in Cabal-1.2.

The instance for Version is in the Text module itself because the
Version type is defined in base. This avoids an orphan instance.

This is intended to replace all these showFoo read/parseFoo functions
we have all over the place. It's like the Read/Show classes but uses
a half decent parser and pretty printer:
class Text a where
  disp  :: a -> Doc
  parse :: ReadP a
This patch just adds the class and an instance for Bool, replacing
the parseBool function used in a few places. More to follow...