[MERGE] cleanup blackbox tests

[Martin Pool]

This patch removes some cruft from the blackbox tests.  There were
many different ways to invoke bzr's command line interface.  This
condenses them down to one interface and one implementation.

As I said in my other mail, for some tests just passing a string to be
autosplit is really the clearest way for many tests.

Other things:

 * new test code should just simply call run_bzr, which returns the
stdout, stderr as strings
 * removed very old TestCase.merge()
 * remove very old and unused BzrTestBase alias for TestCase
 * deprecate some old interfaces: runbzr, run_bzr_captured, capture
 * remove shlex split variant of run_bzr_captured in TestRemove - this
is now available globally
 * i thought about removing the syntax run_bzr('one', 'two') as
varargs - that type of call tends to cause trouble - but i've left it
for now

-- 
Martin
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