patch applied (packages/polyparse): Poly.Lazy needs to override some Poly.Base defns.

[Malcolm Wallace]

Mon May 14 10:02:56 PDT 2007  Malcolm.Wallace at cs.york.ac.uk
  * Poly.Lazy needs to override some Poly.Base defns.
  Otherwise it isn't sufficiently lazy.  In particular, we need to
  override the `apply` combinator, and then to re-code many of the other
  quite general combinators in terms of `apply`, to ensure that they can
  succeed early.

    M ./src/Text/ParserCombinators/Poly/Lazy.hs -7 +105