[merge] Make "bzr info" terse by default

[Aaron Bentley]

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Hi all,

This patch makes "bzr info" terse.  It also speeds it up, because by
default it doesn't include data which takes a long time to calculate.

Example output:
$ ./bzr info
Lightweight checkout (format: dirstate / dirstate-tags)
Location:
 light checkout root: file:///home/abentley/bzr/terse-info/
   shared repository: file:///home/abentley/bzrrepo/
   repository branch: terse-info

On the first line, we try to briefly describe what the object is--
lightweight checkout, shared repository, etc.

This is followed by the short name of the format that they are in.
Where the format is ambiguous, several formats are listed.

Hidden formats are not listed, unless they are the only candidate.

All of the lines formerly displayed by info (especially the stuff that
takes a long time), is displayed by "bzr info -v".  This includes the
number of committers, which was formerly only displayed when "info -v"
was used.

Aaron
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