[MERGE] several small fixes to selftest

[Alexander Belchenko]

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 2205 Alexander Belchenko       2006-12-21
      fix win32 selftest regression introduced by bzr.dev.revno2198

 2206 Alexander Belchenko       2006-12-21
      cherrypicking: test_plugin_help_shows_plugin: fix cleanup after test

 2207 Alexander Belchenko       2006-12-22
      Don't formats unicode strings in test error messages with '%s': it's unsafe

 2208 Alexander Belchenko       2006-12-22
      Command 'selftest' use 'replace' encoding_type to prevent sudden traceback
      if some test try to print unicode characters.

      Actually tests never should try to print unicode, even formatting
      unicode strings with '%s'. But if this happens selftest should not
      blow-up with UnicodeEncodeError traceback.

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