• service table: added control proc member to allow Jemm to call out on
  certain events; currently "device_reboot_notify" is the only call-out.
• service table: added v86faults member - allows programs to hook into
  v86 faults; used by JLOAD.
• Simulate_Int: call an installed v86 hook proc before running the INT.
• JemmEx, XMS AH=0Eh: invalid handle returned if size > 65535 kB; this is
  MS Himem compatible.
• JLMs Reboot & FastBoot added.
• fixed debug displays in 16-bit part.
• fixed debug displays in Jemm16.asm, UnloadJemm.
• JemmEx: option NOE820 reintroduced; it's a noop unless MAXSEXT is 0.
• fixed option UNLOAD: on 80386/80486 cpus, it wasn't safe.
• JLM QPIEmu: added function ax=5000h.
• functionality of cmdline option SB has been extended to make Jemm
  compatible with SB emulation drivers SBINIT/SBEINIT for SB PCI cards.