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

[Chris Jerdonek]

Chris Jerdonek added the comment:

> Reapplying the patch means that I have to do import + commit at least, and possibly reapply manually changes that I've already done on 2.7.

Since 2.7 is more different from 3.2 than is 3.4, it seems more likely that grafting from 2.7 to 3.x will result in having to undo 2.7-specific changes and/or add back 3.x-specific changes, and even more so when skipping 3.2.

But this is all secondary to my point that we shouldn't include in our basic instructions things that we know won't work for some people when there is a straightforward alternative (and one that uses no new concepts).  At the very least, we should provide a working alternative alongside.

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<http://bugs.python.org/issue16930>
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