[issue2892] `hg sum` should display current bookmark info

[Colin Barrett]

New submission from Colin Barrett <timber at lava.net>:

Whichever the currently active bookmark is, it should be displayed in hg
sum. It's an important bit of state now that track.current is True.

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messages: 16775
nosy: cbarrett, durin42
priority: feature
status: unread
title: `hg sum` should display current bookmark info
topic: bookmarks

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Mercurial issue tracker <bugs at mercurial.selenic.com>
<http://mercurial.selenic.com/bts/issue2892>
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