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

[Alexander Belchenko]

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This patch provide new flag to selftest command: --clean.
Run

bzr selftest --clean

to remove all testXXXX.tmp directories.

This is useful on win32 because *too* often selftest itself fails
to cleanup this directories because of Permission Denied errors etc,
and because this directory may contain unicode filenames
that sometimes break plain del command.


Alexander

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