[PATCH V2] util: add allowhardlinks module variable

[Augie Fackler]

> On Mar 11, 2017, at 22:44, Ryan McElroy <rm at fb.com> wrote:
> 
>>>> util: add allowhardlinks module variable
>>> Queued, thanks.
>> 
>> Late to the party here, but why not do this as a config option so one doesn't need an extension to override this?
>> 
> 
> Durham already answered my question in a previous email chain, but I missed it until just now. The answer is this:
> 
> "Might be hard to get a config option down to this level, since there's no ui object around here, but we could probably move the 'False' value to a module level variable so extensions could at least set it to True."
> 
> That resolves my concerns. Thanks!

More rationale:

https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/093816.html

(happy to elaborate if needed)