It seems to me like there are a number of things that should be able to 
hint that you want some particular slots of particular packages, such that 
--depclean doesn't remove them and emerge world updates them.

For example, it shouldn't remove the version of gentoo-sources that your 
/usr/src/linux symlink points to. It shouldn't remove the version of emacs 
you've got eselected. It shouldn't remove a version of tomcat that you've 
got in your default runlevel. It shouldn't remove the Java VM that 
java-config is set to.

For each of these, I think it should handle this information as if the 
particular slot were in your world file, so long as the system is 
configured that way (that is, it shouldn't actually record it in the world 
file that way, but it should act like it saw it there).

Would this be a generally good concept, if I came up with a suitable 
implementation? (Now that the code is set up to carry out the implications 
of such a setting)

	-Daniel
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