Update files to use $hubBaseurl

Remove hard coded references to hub.hackerpublicradio.org to allow hub to be run on different servers and make testing locally possible.

hub/upload.php

@@ -51,7 +51,7 @@ if ( isset( $_GET['delete'] ) ) {
     call412("35a7f4e80ecba8284049e9d6261ae523");
   }
   else {
-    header( "Location: https://" . $_SERVER['SERVER_NAME'] . "/calendar.php" ) ;
+    header( "Location: ${hubBaseurl}calendar.php" ) ;
     $dir_structure = "/home/hpr/upload/" . strtotime($db_timestamp) . "_${ep_num}_${ep_date}_${db_key}/";
     rrmdir("$dir_structure");
     exit;