* basic.texi (Inserting Text): Document ucs-insert.

* basic.texi (Inserting Text): Document ucs-insert.

* mule.texi (International Chars): Define "multibyte".  Note that
internal representation is unicode-based.  Simplify definition of raw
bytes.  Mention ucs-insert.
(Enabling Multibyte): Remove obsolete discussion.  Copyedits.
(Language Environments): Add language environments new to Emacs 23.
(Multibyte Conversion): Node deleted.
(Coding Systems): Remove obsolete unify-8859-on-decoding-mode.  Don't
mention obsolete emacs-mule coding system.
(Output Coding): Copyedits.

* emacs.texi (Top): Update node listing.