[MERGE] 'bzr selftest --clean' allows easily clean temporary tests directories

[Alexander Belchenko]

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After discussion about this change I personally don't think that
bzrtools is *right* solution for me (personally), because not all system
has bzrtools.

I'd like to change 'make clean' to use cross-platform solution by using
python scripts (something similar as I did for clean-docs).

But anyway, why for clean all (that what 'make clean' do) when I want to
clean only temp tests directories?

Alexander

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