pt2-clone: update to 1.39

Changes:

    * Added 128kB sample support again. This can be turned on by adjusting
      the 64K_LIMIT setting in (the new) protracker.ini to FALSE. Please
      read the 64K_LIMIT comment in protracker.ini first before doing this.
    * Fixed a bug where it wasn't always possible to mark the last sample
      point in the sample editor
    * Some other minor code changes

(nia)