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* Separate out the act of mapping in a physical address (with fallbacks to
  progressively older APIs) from the loading or storing of each 1-8 byte
  location, using a system of callback functions.
* Remember which OS_Memory calls (if any) are available on the current kernel
  to avoid having to test them again for each address accessed.
* Defer releasing the temporarily-mapped IO window until the end of the
  respective star command (as permitted by the OS_Memory documentation) to
  effectively halve the number of times the TLB has to be flushed. Note that
  the window will remain mapped if we exit via an exception during memory
  access, but this was the case in previous versions too, and now you can at
  least unmap it by issuing a further *Memory P command that doesn't cause an
  exception.

Version 2.04. Tagged as 'Debugger-2_04'