Rebind "M-f", "M-b", "C-f", "C-b" to history-* commands.
Rebind "M-f", "M-b", "C-f", "C-b" to history-* commands.

button8 and button9 already go backward/forward, so we rebind C-f and C-b to query
for URLs instead.  The first URL is the direct follower, so the previous "C-f"
behaviour can be recreated with "C-f RET".

jmercouris/NeXT,jmercouris/NeXT