rename /user/ to /agent/ and update links to use agent/ instead

agent/js/keepalive.js

@@ -0,0 +1,18 @@
+// Keep PHP sessions alive
+// Sends requests to keepalive.php in the background every 10 mins to prevent PHP garbage collection ending sessions
+
+function keep_alive() {
+
+    //Send a GET request to keepalive.php as keepalive.php?keepalive
+    jQuery.get(
+        "../keepalive.php",
+        {keepalive: 'true'},
+        function(data) {
+            // Don't care about a response
+        }
+    );
+
+}
+
+// Run every 10 mins
+setInterval(keep_alive, 600000);