darcs patch: Fix the version-range parser to allow arbitrary expres...

[Malcolm Wallace]

> I attach a revised version of the patch, that fixes the typo,  
> improves the parser by allowing parentheses in version range  
> expressions, and adds a check that the new syntax is accepted only  
> by cabal >= 1.8.

Argh! That patch still contains a very obvious bug.  Here is yet  
another revised version.

Regards,
     Malcolm
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