[MERGE] Make 'ls' aware of views

[Eduardo O. Padoan]

My first merge request, so I hope I've got everything right.
This patch adds support for the 'ls' command to be aware of active
filtered views.
Currently when you do `bzr ls` and a view is active, all files will be
listed. It should show only the files in the paths of the current
view.
Related to bug #332718.

-- 
    Eduardo de Oliveira Padoan
http://importskynet.blogspot.com
http://djangopeople.net/edcrypt/

"Distrust those in whom the desire to punish is strong."
   -- Goethe, Nietzsche, Dostoevsky
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