Nicolas Pierron 0c16b00cbd Replace the traversal of modules: ...

- Remove handleOptionSets which used option declarations & definitions
in the same set.
- Add a traversal of modules where "config" and "options" are traverse at
the same time.

This allow to have accruate error messages with the incriminated files
playing a role in the error.

This system add a new restriction compare to the previous system:
- A module with no structure (option definitions & option declarations
& require) should not contain any option declarations.  If such module
exists you must convert it to the following form:

{ imports = <content of the require attribute>;
  options = <set of option declarations>;
  config = <set of option definitions>;
}

svn path=/nixpkgs/trunk/; revision=17163

2009-09-15 13:36:30 +00:00

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