Call cabal project to nix (now with hackage-truncate) #135
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That is, something like this:
```
nix-build --expr 'with import ./. {}; callCabalProjectToNix { index-state = "2019-04-30T00:00:00Z"; src = /some/path; }'
```
should produce something that can be build with mkCabalProjectPkgSet.
previously the fetchurl would produce a different store path each and every time as hackage's index is a moving target. With this impurity setup, we can ignore this.
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