[MERGE] DWIM revspecs

[Matthew D. Fuller]

> This bundle adds the ability for revspec's to DWIM for the more common
> types, rather than requiring extra verbosity for everything but
> revnos.

Oh, it also incidentally fixes a bug in the "help revisionspec", which
currently says:

    Some examples of identifiers are [...] 'before:yesterday'

which doesn't actually work with bzr.dev, but does with this change
applied     8-}


-- 
Matthew Fuller     (MF4839)   |  fullermd at over-yonder.net
Systems/Network Administrator |  http://www.over-yonder.net/~fullermd/
           On the Internet, nobody can hear you scream.