Upgrade Mercurial

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/13175">trac #13175</a>.

Diff between the 1.8.4.p1 and 2.2.2.p0 spkgs. For reference / review only.

Reported by: jdemeyer

Component: packages

CC: 

Report Upstream: N/A

Authors: Jeroen Demeyer

Dependencies: 

Work issues: 

Reviewers: Volker Braun

Merged in: sage-5.2.beta1

Attachments: <ol><li><a href="http://trac.sagemath.org/sage_trac/attachment/ticket/13175/mercurial-2.2.2.p0.diff">mercurial-2.2.2.p0.diff: Diff between the 1.8.4.p1 and 2.2.2.p0 spkgs. For reference / review only.</a> by jdemeyer at 20120628T11:36:45</li></ol>