Sun Jun 3 14:35:34 EDT 2012

Fixing RPC

If RPC is to be handled correctly, it needs to be handled in all parts
of the code, meaning:

   host sends RPC request
      -> target answers (0xFF)
      -> target sends RPC request (0xFE)

Cases of "return" and "call" need to be clearly distinguished.  Maybe
it's time to change this a bit such that the addressing is clear.

EDIT: fixed.
Seems to work ok.