function usage () {
echo
+ echo "$1 [-p|--package]"
echo "$1 [-n 3|5] [-w web_dir] [-k <ftok_dir>] [-W]"
+ echo " -p build \"binary\" version of the package"
echo " -h this help"
echo " -n number of players - def. $n_players"
echo " -w dir where place the web tree - def. \"$web_path\""