emacs, dot-emacs: Overhaul of URL browsing in Emacs.

emacs, dot-emacs: Overhaul of URL browsing in Emacs.

Insert a wossname in front of w3m's main function so that it doesn't
take over my current window.  It now tries to reuse the existing w3m
window if there is one, or picks some other convenient window, creating
a new one if necessary.  This makes Hyperspec lookups rather more
convenient, since I can carry on working in the REPL or a Lisp buffer
with the Hyperspec stuff in a fixed place and not worry about w3m
screwing my display over.