first cut at configurations patch, and a couple more

[Einar Karttunen]

On 10.08 06:04, Einar Karttunen wrote:
> On 02.08 11:11, Simon Marlow wrote:
> > A little bit more about configurations.  Here's what you can do with them:
> 
> Implemented parts of the spec. I wish for this to get into 6.6
> to avoid problems e.g. depending on fps. This is alpha quality
> code, but I am willing to work on it to get issues sorted
> quickly.
>

Now it should support most of the things and the parser issues are
resolved. The syntax is:

cond = exp [ "&&" exp | "||" exp ]
exp  = "!" exp
     | "os"   "(" word ")"
     | "arch" "(" word ")"
     | "package" "(" dependency ")"
     | word
     | "(" cond ")"

Dependencies are in the form of package(base < 2.0) rather than
package(base-any, <2.0)

This should be ready for testing.

- Einar Karttunen
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