add turf package to included deps

package.json

@@ -13,7 +13,8 @@
         "cgi",
         "compression",
         "express",
-        "sockjs"
+        "sockjs",
+        "@turf/bezier-spline"
     ],
     "repository": {
         "type": "git",

worldmap/worldmap.js

@@ -16,7 +16,7 @@ var buttons = {};
 var marksIndex = 0;
 var menuOpen = false;
 var clusterAt = 0;
-var maxage = 600;   // default max age of icons on map in seconds - cleared after 10 mins
+var maxage = 900;   // default max age of icons on map in seconds - cleared after 10 mins
 var baselayername = "OSM grey";     // Default base layer OSM but uniform grey
 var ibmfoot = " © IBM 2015,2021"
 var inIframe = false;