Improve the OneRNG installation

src/freedombone

   # install the package
   dpkg -i $ONERNG_PACKAGE
 
-  # check rng-tools configuration
-  if ! grep -q "/dev/$ONERNG_DEVICE" /etc/default/rng-tools; then
-      echo "HRNGDEVICE=/dev/$ONERNG_DEVICE" >> /etc/default/rng-tools
-      systemctl restart rng-tools
-  fi
-
   # Check that the install worked
   if [ ! -f /etc/onerng.conf ]; then
       echo 'OneRNG configuration file not found. The package may not have installed successfully.'
       exit 42904
   fi
+
+  dialog --title "OneRNG Device" \
+         --msgbox "Please plug in the OneRNG device" 6 40
+
+  # check rng-tools configuration
+  if ! grep -q "/dev/$ONERNG_DEVICE" /etc/default/rng-tools; then
+      echo "HRNGDEVICE=/dev/$ONERNG_DEVICE" >> /etc/default/rng-tools
+  fi
+
+  systemctl restart rng-tools
 }
 
 function random_number_generator {

src/freedombone-config

   esac
   case $(cat $data) in
       2) HWRNG_TYPE="beaglebone";;
-      3) HWRNG_TYPE="onerng";;
+      3) HWRNG_TYPE="onerng"
+         dialog --title "OneRNG Device" \
+                --msgbox "Please ensure that the OneRNG device is disconnected. You can reconnect it later during the installation" 8 60
+         ;;
       255) exit 1;;
   esac
   save_configuration_file