[PATCH 1 of 2 v2] hg: replace quietempty with show_stats for clean, merge, and update

[timeless]

Augie Fackler wrote:
>> -        hg.update(repo, self.state.parentctxnode, quietempty=True)
>> +        hg.update(repo, self.state.parentctxnode, show_stats=False)
>
> This strikes me as a slight bummer for users that have progress
> disabled. Should we still print the stats for users with progress off?

[PATCH 2 of 7] histedit: InterventionRequired list action

should result in people knowing where they are when they're using
histedit (with or without progress)