Improve final install instructions for onion variant

src/freedombone-image-customise

     echo '            shred -zu ~/login.txt' >> $rootdir/root/.bashrc
     END_MESSAGE1=$'Congratulations!'
     if [[ $VARIANT != "mesh" && $VARIANT != "meshclient" && $VARIANT != "meshusb" && $VARIANT != "usb" ]]; then
-        END_MESSAGE2=$'\nYour system has now installed\n\nThe onion ssh service is at $SSH_ONION_HOSTNAME\n\nPress any key to reboot and begin using it'
+        END_MESSAGE2=$'\nYour system has now installed\n\nThe onion ssh service is at:\n\n  ssh ${MY_USERNAME}@${SSH_ONION_HOSTNAME} -p ${SSH_PORT}\n\nTo copy the above address hold down the shift key and double left click on it, then right click and select "copy".\n\nPress any key to reboot and begin using the system'
         echo '            SSH_ONION_HOSTNAME=$(cat /var/lib/tor/hidden_service_ssh/hostname)' >> $rootdir/root/.bashrc
 
         echo '            if [ ${#SSH_ONION_HOSTNAME} -lt 2 ]; then' >> $rootdir/root/.bashrc
         echo '                exit 62392' >> $rootdir/root/.bashrc
         echo '            fi' >> $rootdir/root/.bashrc
+        END_MESSAGE_HEIGHT=16
     else
         END_MESSAGE2=$'\nYour system has now installed\n\nPress any key to reboot and begin using it'
+        END_MESSAGE_HEIGHT=12
     fi
-    echo "            dialog --title '$END_MESSAGE1' --msgbox \"$END_MESSAGE2\" 12 50" >> $rootdir/root/.bashrc
+    echo "            dialog --title '$END_MESSAGE1' --msgbox \"$END_MESSAGE2\" ${END_MESSAGE_HEIGHT} 60" >> $rootdir/root/.bashrc
     echo '            reboot' >> $rootdir/root/.bashrc
     echo '        fi' >> $rootdir/root/.bashrc
     echo '    else' >> $rootdir/root/.bashrc