Bugzilla Bug 211588

When neither portage-utils, gentoolkit or epm are installed print_installed()
makes some really stupid assumptions. This causes it to run best_version on
metadata.xml and possibly CVS... It is also icky with binpkgs which really
shouldn't require PORTDIR..

Is this function really necessary at all? Why not just tell the users that
every installed package in the x11-drivers/ category needs to be reinstalled?
If you want to be nice you can suggest using `qfile -IC x11-driver` from
portage-utils to list them but certainly that should do?

This does look a bit icky.  Can't we just give them the command to run like you
do a few lines below?

23:09 <      zlin@> dberkholz: basically I'd just like to get a response on 
                    bug #211588
23:09 <    jeeves+> zlin: https://bugs.gentoo.org/211588 nor, P2, All, 
                    zlin@gentoo.org->x11@gentoo.org, NEW, pending, 
                    print_installed in x11-base/xorg-server-1.4.0.90-r*
23:10 < dberkholz@> zlin: multiple people requested that i actually give them 
                    a list, for whatever reason
23:11 < dberkholz@> spending a whole lot of time dealing with it feels like a 
                    huge waste of time to me
23:11 <      zlin@> dberkholz: 1) that doesn't mean it's a good idea. 2) the 
                    current implementation sucks.
23:11 < dberkholz@> fix it
23:11 < dberkholz@> you've got commit access =)
23:11 <      zlin@> well, I happen to think it's a bad idea to begin with.
23:12 < dberkholz@> so fix it that way, and i'll just point anyone who whines 
                    in your direction
23:12 <      zlin@> but at the very least please comment on the bug.
23:12 <     jakub@> good ideas are overrated :P
23:12 <      zlin@> that's fine.