[MERGE] fix add in view-aware trees

[Ian Clatworthy]

Ian Clatworthy wrote:
> This patch fixes a bad bug, https://bugs.launchpad.net/bzr/+bug/344708.

> Most of this patch is new tests. I've expanded the tests so that the
> blackbox add tests are executed for both a format not supporting views
> and one supporting views.

As Robert suggested, this is now done using multiple_tests() instead of
subclassing TestAdd in the attached patch. I haven't used multiple_tests()
before so I'd appreciate it if someone could confirm I'm using it correctly
and in the best way.

Ian C.
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