Checks for case insensitive and name-mangling filesystems in purge

[Emanuele Aina]

Alexis S. L. Carvalho spostò:

>> If you think that purge is ready for hgext the old patch I've sent
>> should still apply. :)
> 
> Also in crew.

Wonderful. :)

Thanks again.

-- 
Buongiorno.
Complimenti per l'ottima scelta.