Oops! I had no trouble deleting the news package with my two test instances, myself... Maybe you run on some old code? If you just have a test system and you're not being able to delete the package from the package manager, the easiest thing to do would probably be to drop the whole thing and download the latest 4.6 test tarball:
http://dev.openacs.org/projects/openacs/4.6/download/download-verify?revision_id=47732
and try it there.
I'm not sure why you'd want to remove your news package in the first place, though. Changing one line in news-procs.tcl would probably have been enough. (The first error you described is present in the latest code as well).
If you run a production system and don't want to reinstall all packages, you should post the error message you get when you try to delete the package and tell us from where you're trying to do it.
