Call change_frame_size and do_pending_window_change with

Call change_frame_size and do_pending_window_change with
new parameter.
(ok_to_echo_at_next_pause): Make it a pointer to
a struct kboard.
(echo_kboard): New.
(echo_now): Set echo_kboard to the current kboard.
(cancel_echoing): Set echo_kboard to null.
(cmd_error_internal): Use clear_message, remove references
to echo_area_glyphs and echo_area_message.
(command_loop_1): Check for echo area messages differently.
(read_char): Likewise.
(record_menu_key): Use clear_message.
(Fexecute_extended_command):  Check for echo area messages
differently.  Use push_message, restore_message, pop_message.