[issue16930] mention limitations and/or alternatives to hg graft

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Why must we mention graft at all?  I've never had a need for it.  It
> seems simpler and just as effective to run `hg import` on the
> original patch.

`hg graft` actually works in some cases where `hg import` will fail,
because grafting uses the merge logic (so, for example, it is able to
recognize that some files were renamed between branches).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16930>
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