updated test suite support

[Aaron Bentley]

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Robert Collins wrote:
> There are now two distinct base classes for writing test cases:
> bzrlib.selftest.TestCase and bzrlib.selftest.FunctionalTestCase
> The former is appropriate for any 'memory-only' test cases that you
> write. It sets up a log and captures mutter() etc calls.
> FunctionalTestCase's setup constructs a temporary directory for your
> test to run in and chdirs you to it.

I'm not sure about those names.  InTempDir is a lot more obvious.  I'm
not sure why testing an ImmutableStore would be 'functional', but
testing some iterator behavior would not be.

Aside from that, these changes look really good.

Aaron
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