lfs: don't require the .hglfs file to be tracked to control the policy
The .hgignore file doesn't need to be tracked, nor does the git equivalent of
this file. I'm still a little concerned about the effects of forgetting to
commit this file. But the fact that conversions maintain the hashes if only the
normal vs external storage changes, should make this less risky.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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