Log Message:
Update emacs-w3m-snapshot to 1.4.442.20110729.

Changes:
	* w3m.el (w3m-delete-buffer): Switch to the previous emacs-w3m buffer
	explicitly; bind frame-auto-delete and ignore-window-parameters while
	killing the buffer.
	(w3m-goto-url): Change the order of retrieving group:* urls so as to
	arrange the buffer list in turn.

	* w3m.el (w3m-goto-mailto-url): Pass other headers to the agent.

	* w3m-ems.el (w3m-toolbar-define-keys): Work around the Emacs 24 error
	"`keymap' is reserved for embedded parent maps".

	* w3m.el (w3m-content-type-alist): Use functionp instead of symbolp for
	the users who set their own private function to
	browse-url-browser-function.

	* w3m.el (w3m-content-type-alist): When selecting which external html
	browser to use, handle the case where browse-url-browser-function is
	an alist.

	* w3m.el (w3m-goto-mailto-url): Decode entities in URL.