[merge] Separate Test home and working dir

[John Arbash Meinel]

The attached patch separates the $HOME directory from the working
directory for the test suite, and fixes up tests that work working
around that fact.

This should help the whole test suite to pass on both win32 and on mac.
And it simplifies the test suite a bit.

It does potentially break plugin tests. I saw this test fails:
bzrlib.plugins.email.tests.testemail.TestGetTo

And it does so, because it assumed it was being run in a directory named
after the plugin test, rather than some other 'branch nick'. (now it
would be 'work'.

And the best part is that diffstat says:
 11 files changed, 43 insertions(+), 67 deletions(-)

Because I was able to remove a lot of the old 'ignore' lines.

John
=:->

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