[issue15] rsync support

[Nick Brown at Labix Tracker]

Nick Brown <nickbroon at blueyonder.co.uk> added the comment:

I think rsync would be very useful for updating the channel information.      
In the case of a urpm channel, updating the hdlist.cz would be much quicker if     
rsync was used to sync the local copy with the remote one. For example, this  
is the way that the urpmi.update command uses it.  
(see /usr/lib/perl5/vendor_perl/5.8.7/urpm/download.pm)

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