1. edit ku/history and ku/install and set the correct version and
   and timestamp

2. run jtdeb-rebuild once, the script will download the appimage
   from upstream website, and proceed to build the package; on
   successful finish the appimage will be saved (MOVED) to
   $PRJ/work directory

3. NOTE! a copy of appimage in $PRJ/work directory will be used,
   if present, instead of downloading it
