Increased JSON request timeout

Some JSON requests were timing out with slow internet speeds.

Request timeout increased: 20s -> 45s

Affects issues:
- Close #1185

Plan/common/src/main/resources/assets/plan/web/js/xmlhttprequests.js

@@ -26,9 +26,9 @@ function jsonRequest(address, callback) {
                 }
             }
         };
-        xhttp.timeout = 20000;
+        xhttp.timeout = 45000;
         xhttp.ontimeout = function () {
-            callback(null, "Timed out after 20 seconds. (" + address + ")")
+            callback(null, "Timed out after 45 seconds. (" + address + ")")
         };
         xhttp.open("GET", address, true);
         xhttp.send();