Precis

Copperbox revision 1462.

I've started a new scheme to resolve the module files described by a package. As in Precis 0.4.0, modules will be resolved before the "Package" data type is delivered to the API client.

Towards this end, I've split the data types into two modules to represent final and interim types and I've started work adapting the ResolveM monad to accumulate resolved modules as the cabal file is processed.