repair: use cg3 for treemanifests
The newly created helper changegroup.safeversion() knows to pick
version 03 if the repo uses treemanifests, so just using that means we
pick the right changegroup version.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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