Merge from Ben Finney's RCS unittest patch

This involved an `upgrade' of BE's bzr repo
Previous version (via `bzr info path/to/repo`): pack-0.92
Current version: rich-root-pack

The whole rich-root thing is a bzr features-vs-backwards-compatability
thing they've been wrestling with [1,2,3,4,...].  It seems that BE was
in some sort of unstable equilibrium [5], so I'll follow Ben's lead
and make the official switch.  Note that you'll need to use bzr>=1.5
to make the shift [6].  For the sake of completeness, the whole
rich-root thing was introduced here [7], but I don't understand enough
of bzr to make sense of the diff.  It just versions the repo's root
directory the same way it versions other directories [3].  The bzr
people seem to be planning to phase out non-rich-root formats in favor
of brisbane-core, aka 2.0beta [8], by bzr 2.0 [8], which is apparently
on the horizon [9,10,11].  What a headache.

Citations are all titles/X-List-Received-Date from
  https://lists.ubuntu.com/archives/bazaar/
with the exception of the URL [11].

[1] [RFC] rich root pack as default in 1.8 ?
  Sat, 06 Sep 2008 03:33:46 -0000
  (conclusion: none)
[2] Re: 1.9rc1 countdown
  Thu, 30 Oct 2008 08:44:53 -0000
  (conclusion: "primary" format should be rich-root next time we make a new format)
[3] So many repo formats
  Fri, 14 Nov 2008 08:41:33 -0000
  Mon, 17 Nov 2008 07:37:47 -0000  (explains rich-root format)
  Mon, 17 Nov 2008 22:37:39 -0000  (explains no-return policy)
  Mon, 17 Nov 2008 20:57:08 -0000  (explicitly lists non-svn reasons for rich-root)
[4] Branch fails from 'pack-0.92' repo to 'rich-root-pack' repo.
  Wed, 27 Aug 2008 11:31:11 -0000
  (we're not sure again)
[5] Branch fails from 'pack-0.92' repo to 'rich-root-pack' repo.
  Sun, 20 Apr 2008 12:58:09 -0000
[6] Branch fails from 'pack-0.92' repo to 'rich-root-pack' repo.
  Fri, 29 Aug 2008 13:23:52 -0000
[7] [RFC] Knit format 2
  Fri, 25 Aug 2006 22:55:36 -0000
[8] bazaar 2.0beta format for launchpad release
  Fri, 29 May 2009 06:00:03 -0000
[9] Upgrading loggerhead to 1.9-rich-root
  Mon, 11 May 2009 22:35:28 -0000
  (mentions eventual switch to rich-root in 2.0)
[10] bzr 1.16rc1 released!
  Fri, 12 Jun 2009 08:00:08 -0000
  (confirms eventual switch to rich-root in 2.0)
[11] https://launchpad.net/bzr/+announcement/2733
  (current outstanding releases: 1.17, 2.0)

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