- New command display-message (alias display) to display a message in the

status line (bound to "i" and displays the current window and time by
  default). The same substitutions are applied as for status-left/right.
- Add support for including the window index (#I), pane index (#P) and window
  name (#W) in the message, and status-left or status-right.
- Bump protocol version.

From Tiago Cunha, thanks!

key-bindings.c

@@ -119,6 +119,7 @@ key_bindings_init(void)
 		{ 'c', 			  0, &cmd_new_window_entry },
 		{ 'd', 			  0, &cmd_detach_client_entry },
 		{ 'f', 			  0, &cmd_command_prompt_entry },
+		{ 'i',			  0, &cmd_display_message_entry },
 		{ 'l', 			  0, &cmd_last_window_entry },
 		{ 'n', 			  0, &cmd_next_window_entry },
 		{ 'o', 			  0, &cmd_down_pane_entry },