[MERGE] Remove tab characters

[John Arbash Meinel]

There were 2 files in the bzrlib source that used tab characters. The
attached patch fixes them, and adds a test to 'test_source.py' to check
that none of the bzrlib source files have a real tab character.

In general, we don't need them, since in a string you can use '\t', and
in the file you should be using spaces anyway.

Mostly the test is to prevent us from accidentally merging a patch which
adds tab characters. We can usually spot them in review, but just in case.

Now if only we had a test for PEP-8. I've thought about writing one, but
it isn't very straightforward to get all the edge cases right.

John
=:->
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