Tidy up handling of Git references. #39
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We currently do a lot of fiddly wrangling of Git remotes and references.
We do things like adding remotes to the config of local Git repositories which we then have to clean up later. This is not really needed as we can just interact with the remotes directly.
We can also remove all the places where we convert from
refs/*torefs/remotes/remote/*and vice-versa since this just introduces confusion. Since we're only ever pulling from one place we don't really need any namespacing of references - instead we can just behave like Git's--mirrorflag.