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

[Wouter van Heyst]

Wouter van Heyst has voted +1 (conditional).
Status is now: Conditionally approved
Comment:
I don't suppose then temporary dir regex is easily acquired from the spot where they are created? Not that I expect the naming to change, but having tests won't hurt.

For details, see: http://bundlebuggy.aaronbentley.com/request/%3Celjfru%24tr0%241%40sea.gmane.org%3E