Can go back to using a dynamic IP address

src/freedombone-controlpanel

@@ -1256,6 +1256,37 @@ function change_system_name {
     esac
 }
 
+function set_dynamic_IP {
+    NETWORK_IS_STATIC=0
+    read_config_param "NETWORK_IS_STATIC"
+    if [ ${NETWORK_IS_STATIC} -eq 0 ]; then
+        return
+    fi
+
+    revert_to_dynamic=
+    dialog --title $"Return to using a dynamic IP address" \
+           --backtitle $"Freedombone Control Panel" \
+           --yesno $"\nDo you wish to go back to using a dynamic IP address?" 8 60
+    sel=$?
+    case $sel in
+        0) revert_to_dynamic=1
+           ;;
+    esac
+
+    if [ $revert_to_dynamic ]; then
+        remove_config_param "NETWORK_IS_STATIC"
+        if [ -f /etc/network/interfaces_original ]; then
+            cp /etc/network/interfaces_original /etc/network/interfaces
+        fi
+        clear
+        echo ''
+        echo $'Changing to a dynamic IP address.'
+        echo ''
+        echo $"System is rebooting. You may need to close this terminal and log in from a new one."
+        reboot
+    fi
+}
+
 function set_static_IP {
     IPv4_address=$(get_ipv4_address)
     IPv4_address_base=$(echo "$IPv4_address" | awk -F '.' '{print $1"."$2"."$3}')
@@ -1280,6 +1311,7 @@ Enter a static local IP address for this system.\n\nIt will typically be ${IPv4_
     case $sel in
         0) NEW_STATIC_IP=$(<$data)
            if [[ "$NEW_STATIC_IP" != *"."* ]]; then
+               set_dynamic_IP
                return
            fi
            ;;