[MERGE] (correct one!) Create fork and reinvoke parallel testing support.

[Robert Collins]

Please ignore the other, 1.4M bundle. It was a mistake :).

This is the polished parallel test support code I've been aiming at for
a week or so now. I did a spike on it one evening and showed it to
Vincent, who prompt fixed a few genuine test suite bugs, and also added
(though in a different place :)) the code that is now in
BZRTransformingResult.

Its not tested :(. I can but its possibly (probably :P) tricky to test
well & cheaply.

This feature has a dependency on a specific branch of testtools:
lp:~lifeless/testtools/ThreadsafeTestForwardingresult is needed to get
the generic parallel testing support, and the feature also depends on
subunit to do test remoting.

To use,
bzr selftest --parallel=fork, or =subprocess. I have a plugin for ec2
support - I'm not at all sure we want that in the core.

I'll obviously add a NEWS entry if the patch is acceptable, but I
thought it was time to get it reviewed :).
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