(archive-extract): Make it work as a mouse binding.

(archive-extract): Make it work as a mouse binding.
(archive-mouse-extract): Make it an obsolete alias.
(archive-mode-map): Don't use archive-mouse-extract any more.
(archive-mode, archive-extract): write-contents-hooks ->
write-contents-functions.
(archive-arc-rename-entry, archive-lzh-rename-entry): Remove unused
first arg.
(archive-rename-entry): Update the call.
(archive-zip-summarize): Remove unused var `method'.
(archive-lzh-summarize): Remove unused var `creator'.