~/.tmux.conf: Use sakura-style keys for switching/creating tabs

Actually they're panes, but this works nicely for me so far.  The only
problem is that I don't seem to be able to map shift...

.tmux.conf

@@ -36,6 +36,10 @@ bind-key -n F6 select-window -t 5
bind-key -n F7 select-window -t 6
bind-key -n F8 select-window -t 7
bind-key -n C-PageUp select-window -t:-1
bind-key -n C-PageDown select-window -t:+1
bind-key -n C-T new-window -c "#{pane_current_path}"
set -g status-keys emacs
bind-key -T copy-mode-vi ? command-prompt -i -I "#{pane_search_string}" -p "(search up)" "send -X search-backward-incremental \"%%%\""
bind-key -T copy-mode-vi / command-prompt -i -I "#{pane_search_string}" -p "(search down)" "send -X search-forward-incremental \"%%%\""