Onion only option

src/freedombone-config

 DH_KEYLENGTH=
 MINIMAL_INSTALL="yes"
 DEFAULT_LANGUAGE='en_GB.UTF-8'
+ONION_ONLY="no"
 
 function show_help {
     echo ''
     if [ $DH_KEYLENGTH ]; then
         echo "DH_KEYLENGTH=$DH_KEYLENGTH" >> $CONFIGURATION_FILE
     fi
+    echo "ONION_ONLY=$ONION_ONLY" >> $CONFIGURATION_FILE
 }
 
 # test a domain name to see if it's valid