emacs 21 add-on packages
The packages like gnus and calc in emacs 21 once emacs 22 is installed are
superfluous packages because both calc and gnus are included as commands
that can be run inside emacs 22. There may be other emacs add-ons in this
class, I don't know for sure. It's possible timidity-el and edb may be in
this class as well. What happens when someone tries installing a
superfluous package in aptitude or apt-get is a can't get file lock error.
Wouldn't it make more sense to inform the user in these and similar
situations that they're attempting to install superfluous packages and
that if they continue in this case emacs 22 will have to be removed and
replaced by emacs 21 a downgrade and then the requested packages will then
be installed?
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