boolenqueue_and_echo_command(constchar*cmd,boolsay_ok=false);//put a single ASCII command at the end of the current buffer or return false when it is full
boolenqueue_and_echo_command(constchar*cmd,boolsay_ok=false);// Add a single command to the end of the buffer. Return false on failure.
voidenqueue_and_echo_commands_P(constchar*cmd);//put one or many ASCII commands at the end of the current buffer, read from flash
voidenqueue_and_echo_commands_P(constchar*constcmd);// Set one or more commands to be prioritized over the next Serial/SD command.