Configurable wifi channel

src/freedombone-client

     -h|--help)
     show_help
     ;;
+    --essid)
+    shift
+    ESSID="$1"
+    ;;
+    --channel)
+    shift
+    WIFI_CHANNEL=${1}
+    ;;
     *)
     # unknown option
     ;;

src/freedombone-config

   #fi
 
   if [[ $SYSTEM_TYPE == "$VARIANT_MESH_USER" ]]; then
-      freedombone-client
+      freedombone-client --essid $ESSID
       if [ "$?" = "0" ]; then
           clear
           echo ".---.                  .              .                   "