darcs patch: Add liftField and maybeField to ParseUti... (and 1 more)

[Bertram Felgenhauer]

Hi,

I've discussed the patch with Duncan Coutts. The result is the attached
revised patch. Changes:

- fix the handling of 'x-' fields - with the previous patch cabal would
  complain about these as unknown in most contexts
- document liftField and maybeField and make their use for converting
  stanzas more obvious in PackageDescription.hs

The second patch is unchanged. A note on installing packages hidden:
This should be useful for programs that provide their own plugins or
other libraries for internal use. It seems to be simple enough for
inclusion in Distribution.Simple.

regards,

Bertram
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