windows command-line parser replaces \ with /

In bzr 2.1.0b3 there is landed patch from John Meinel for custom support of globs in command line.

Unfortunately it introduce bad regression: all backslahes replaced with forward ones even for non-filenames. See:

C:\Temp>bzr init 5
Created a standalone tree (format: pack-0.92)

C:\Temp\5>bzr mkdir foo
added foo

C:\Temp\5>bzr st
added:
  foo/

C:\Temp\5>bzr mkdir foo\bar
added foo/bar

C:\Temp\5>bzr ci -m foo\bar
Committing to: C:/Temp/5/
added foo
added foo/bar
Committed revision 1.

C:\Temp\5>bzr log
------------------------------------------------------------
revno: 1
committer: Alexander Belchenko <email address hidden>
branch nick: 5
timestamp: Fri 2009-11-20 14:24:59 +0200
message:
  foo/bar

Commit message should be "foo\bar" not "foo/bar".

Please, don't break Windows standard. Pretty please!