This allows us to make the various netlist and pcb update routines
more atomic and less reliant on carefully sequenced asynchronous
messages.
This is also a prelude to adding support for footprint testing
without a netlist.
*) void KIWAY::ExpressMail( FRAME_T aDestination, MAIL_T aCommand, const std::string& aPayload, wxWindow* aSource=NULL );
*) virtual void KiwayMailIn( KIWAY_EXPRESS& aEvent );
*) enum MAIL_T expansion into the brave new world if cross KIWAY_PLAYER communications.
Let the KIWAY_PLAYING begin.....
through well conceived mail from one KIWAY_PLAYER to another.
Get thinking now. Add a new MAIL_T value, then send ExpressMail(),
and receive it in KiwayMailIn(), it's that easy.