[MERGE] faster info -v

[Ian Clatworthy]

The speed of info -v has been driving my crazy lately because
I'm frequently running that command when upgrading and
importing branches. This patch omits the one statistic
(# of committers to a branch) causing the problem from
the info -v output. To get the statistic back, use info -vv.
I've improved and expanded the help for info accordingly.

Speaking to poolie, he thought this was already done, so
this issue has obviously come up before. He also mentioned
that there's a repo-stats plugin which is the preferred place
for this sort of detailed statistical analysis going forward.

Ian C.
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