Updated configuration as follows:
-  Number of virtual machines 32 instances
-  Parameter stack depth 256 cells
-  Return stack depth 128 cells
-  Subroutine stack depth 128 cells
-  Exception stack depth 16 cells
-  User data area 2048 bytes

Fixed bug where an interrupt preceeds a PAUSE

Started to make FORTH system software multi-tasking safe
-  removed TIMEOUT
-  inserted PAUSE into KEY? and MS (revised code)