[PATCH 4 of 4] copy: add flag for disabling copy tracing

[Pierre-Yves David]

On 02/03/2015 03:20 AM, Durham Goode wrote:
> # HG changeset patch
> # User Durham Goode <durham at fb.com>
> # Date 1422386787 28800
> #      Tue Jan 27 11:26:27 2015 -0800
> # Node ID 39427c27d17d5d13bbe24367d458705dd9a6d64a
> # Parent  7c2e0203750f9372d77c374ce931e0bb87a54f0f
> copy: add flag for disabling copy tracing

I believe the main motivation for this patch was extremely inflated by a 
performance regression in 3.3-rev. Now that the regression is fixed I 
think it would be wiser to not disable this important Mercurial feature.

-- 
Pierre-Yves David