Bug#804267: mercurial/mercurial-crecord conflict preventing testing migration.

[peter green <plugwash@p10link.net>]

severity 937009 serious
thanks

mercurial can no longer be built in testing because of a build-dependency on python-docutils which has been removed.

This is fixed in unstable, but mercurial is blocked from migrating to testing because it
declares a conflicts on mercurial-crecord (<= 0.20151121-2)

I think the <= should be changed to << because conflicting with a transitional dummy package
does not make sense, but I am not in any way an expert on mercurial.