Handle slow startup of the web server.

If the web server is slow to start, we may need to retry the initial
page load. Implement a retry system that will retry the initial load
4 times, after 1, 2, 3 and 4 seconds, before giving up and leaving
the user with an error message and a link to retry manually.

runtime/Server.cpp

@@ -25,7 +25,7 @@
 Server::Server()
 {
     // Initialise Python
-    Py_SetProgramName(PGA_APPNAME.toUtf8().data());
+    Py_SetProgramName(PGA_APP_NAME.toUtf8().data());
     Py_Initialize();
 }