Remove a lot of old and obsolete info.
(titlepage): Simplify. (Emacs 19 MUAs, Emacs 18 MUAs, MH-E with any Emacsen) (VM with any Emacsen, GNEWS with any Emacsen) (Overloading for Non-conforming MUAs, Version 3 Changes) (The Supercite Mailing List): Delete nodes. (Introduction): Remove info about old packages. (Getting Connected): Simplify. Remove info about old packages. (Citing Commands): Delete Emacs 19 info. (Hints to MUA Authors): Simplify. (Thanks and History): Merge in some info from the deleted node "Version 3 Changes".
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