
   Changelog

   - changed code so OPTION OLDSTRUCTS could be removed.
   - moved uninitialized arrays from .data to .data?, reducing
     binary size of CWD.OVL by about 32kB.
   - fixed: missing POP in handler for exception 0Ch.
   - trap EXCeption 00 instead of INTerrupt 00.
   - trap invalid opcode exception 06.
   - fixed: register ecx used in a loop was modified by int 31h, ax=ff08h,
     causing an infinite loop in .map file was scanned.
