[MERGE] special case the no-args version of revision-info

[Michael Hudson]

Reading this post:

http://blog.orebokech.com/2008/03/emacs-in-bzr-initial-impressions.html

I was prompted to look at the implementation of version-info.  It seems 
to be a bit whole-history happy: RevisionSpec.in_branch calls 
revsion_history() and the command implementation calls 
get_revid_to_revno_map().

This bundle just makes it really fast for the no-arg case.  Perhaps it 
would be better to improve the interpretation of "revno:-$SMALLINT".

Cheers,
mwh
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