Calling conventions and register sets

[Dan Sugalski]

I've updated PDD03 to deal with unprototyped/prototyped calling 
better, have added in a savetop/restoretop pair of ops to save and 
restore R16-31 of all the register sets (better for sub calls if you 
want it all) and updated PDD03 to reflect that, too.
--
                                        Dan

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Dan Sugalski                          even samurai
[EMAIL PROTECTED]                         have teddy bears and even
                                      teddy bears get drunk