Changes from 1.2 to 1.3:
~~~~~~~~~~~~~~~~~~~~~~~~

- fixed bug which zeroed memory when running under another DPMI provider.
  This caused PMODE/DJ programs running under CWSDPMI to trash it's code.
- upgraded the stub loader code to 2.02 functionality and made it consistent
  (as much as possible) with the stub loader code used by CWSDSTUB.
- fixed several bugs in the stub with missing segment overrides, causing
  variables to be stored in the wrong places.
- added support for more than 64Mb of raw memory using extended BIOS functions.
  If more than 64Mb is available the int 15 hook won't return the proper values.
- added support for more than 64Mb of XMS memory using extended XMS functions.