Log Message:
Changes 1.3.1:
* Fixed HD boot drive when drive C: does not exist. TOS 2.06 was
  crashing during the boot process when drive C: did not exist, but
* Fixed drive enumeration of GEMDOS HD emulation. Single partition
  GEMDOS HD emulation did not work anymore when an ACSI HD image was
  also used, due to some problems with the automatic drive letter detection.
* Fix ConnectedDriveMask with multiple, non-contiguous GEMDOS partitions.
* Fix to incorrect use of DESTDIR in python-ui installation
* more compact debugger output (return to emulation msg)
* update copyright, fix trace settings names
* fix: debugger memdump/disasm show/save/load need now to use '$' for hex
* Improved the CSS of the manual and compatibility list. The "font-
  family:Fixed" did not work at all on Windows. Also cleaned up the
  CSS in general.
* The hatari icons for the Windows executable must not be put into an
  archive for linking.