[C] Revamp package path searching

I've committed this one. Moiself> 2004-12-18 Mike Sperber <mike(a)xemacs.org&gt; Moiself> * package-admin.el: Moiself> * startup.el: Reflect the changes made in packages.el. Moiself> * packages.el: Moiself> * loadup.el: Moiself> * make-docfile.el: Moiself> * package-admin.el: Moiself> * startup.el: Moiself> * update-elc.el (early-package-hierarchies) Moiself> (late-package-hierarchies) Moiself> (last-package-hierarchies): Renamed these from `early-packages', Moiself> `late-packages' and `last-packages'. Moiself> * packages.el: Rewrote package-finding logic to separate the Moiself> concepts of "package directories" and "package hierarchies". Moiself> Added explanation of these concepts. Moiself> * setup-paths.el: Moiself> * find-paths.el: Added parameter descriptions to some of the Moiself> docstrings. Moiself> * packages.el, setup-paths.el: Make terminology more explicit Moiself> about "package hierarchies" Moiself> * startup.el (emacs-roots, emacs-data-roots) Moiself> (user-init-directory-base, user-init-directory) Moiself> (user-init-file-base, user-init-file-base-list) Moiself> (user-home-init-file-base-list) Moiself> (load-home-init-file, load-user-init-file-p) Moiself> (startup-find-load-path, startup-setup-paths) Moiself> (startup-find-load-path-for-packages): Moved these back from Moiself> setup-paths.el where they belong---setup-paths.el now again, as Moiself> documented, contains no code that sets global variables. (They Moiself> were moved from startup.el to setup-paths.el on 2003-02-28.) Moiself> Clarify that in the comment at the top. Moiself> * setup-paths.el (paths-find-emacs-roots): Restored Moiself> `invocation-directory' 'invocation-name' parameters removed on Moiself> 2003-02-28; they're useful for debugging. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla