[MERGE] Unit tests for win32 glob expansion

[Kuno Meyer]

Just unit tests, no code change of win32utils.glob_expand().

1) The behaviour of glob_expand() is more or less identical to the Unix 
shell glob expansion, with the exception of wildcards where 
capitalisation and the path separation char are treated more lazily.

2) Added a black box test for invoking "bzr add" with several wildcard 
arguments.

It runs just under Win32 because I think under Unix even with 
"run_bzr_subprocess" no glob expansion happens, since the corresponding 
"subprocess.POpen" instance gets created with leaving the "shell" 
parameter to False.

(And then again, I haven't a complete enough Linux installation 
available to run the tests before submitting.)

Kuno
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