added tmux send-pane

tmux.conf

@@ -52,6 +52,7 @@ bind -r k resize-pane -U 2
 bind -r h resize-pane -L 2
 bind -r l resize-pane -R 2
 bind-key b command-prompt -p "create pane from:"  "join-pane -s ':%%'"
+bind-key v command-prompt -p "send pane to:"  "join-pane -t ':%%'"
 
 # window title
 set-option -g set-titles on