[Pbuilder-maint] autoremove

[Loïc Minier]

        Hi,

 I just pushed an "apt-get autoremove" run after "apt-get upgrade"; this
 should notably get us rid of libcwidget0 in chroots with aptitude (and
 probably of older stuff like libdb*).

 It might be more elegant to simply set APT::Get::AutomaticRemove in an
 APT config file or on the command line during upgrades, but I couldn't
 get immediate answer on whether this is honored for upgrades.

 There's also the question of purging: I think it's safest to not
 purge such automatically removed packages, but this is also leaving
 some harmless cruft behind.  Perhaps we should allow people to override
 this at some point.

   Cheers,
-- 
Loïc Minier