* doc/emacs/building.texi (Lisp Libraries): Describe how to manually load packages in the init file. Mention the 'site-lisp' subdirectory of the default 'load-path'. * doc/emacs/package.texi (Packages): Describe manual installation of ELisp packages. Suggested by Jean-Christophe Helary <jean.christophe.helary@traduction-libre.org>.