Fixes killercup#177. If this flag is provided, all dependencies upgraded will be blindly upgraded to the version specified. Also, there has been substantial refactoring. The new `Manifests` and `Dependencies` structs now hold the logic for upgrade. This allows us to commonise the cases of a single upgrade and full workspace upgrade quite considerably. This should also make it fairly simple to extend to permit providing a list of packages to confine upgrades to. Also does some tidying up for the new `--precise` option. Most significantly, we now have a test for this functionality.

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Commits on Feb 5, 2018

Commits on Feb 11, 2018

Commits on Feb 16, 2018