* lisp/emacs-lisp/package.el: New "external" package status
An external package is any installed package that's not built-in and not from `package-user-dir', which usually means it's from an entry in `package-directory-list'. They are treated much like built-in packages, in that they cannot be through the Package Menu deleted and are not considered for upgrades. (package-desc-status): Identify if a package is installed outside `package-user-dir'. (package-menu--print-info-simple) (package-menu--status-predicate): Add support for it. * etc/NEWS: Document it.
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