Deb package: New upstream release

  * debian/copyright: Add fortuner2.appdata.xml, CC0-1.0
  * debian/control: Remove Build-Depends on imagemagick as the xpm icon is
    installed by upstream Makefile
  * debian/rules: Don’t generate the xpm icon
  * debian/menu: Use the upstream location of the xpm icon
  * Removed debian/clean, debian/install