Only remove the blacklist if $blacklist contains $tmp. This
fixes removing real blacklists, hopefully.
More important: remove the $rem code, instead I use a small
snippet at the end in case the regular code fails, as
{r_,}proc_pkgs now handles removing packages just fine, no
need to do this additionally. I think when removing packages
it's best to rely first on package lists, as that's more likely
to get most packages that should get removed.
So when removing `kde', it will get the kde/ directory of
ktown or series, whichever comes first (REPOPRIO must be
defined for this to work).