Don't do queries to get profile field values that are in the session. Saves...

Don't do queries to get profile field values that are in the session. Saves three queries every page load.

htdocs/auth/lib.php

@@ -727,7 +727,15 @@ function auth_check_required_fields() {
     require_once('pieforms/pieform.php');
     $elements = array();
 
+    $alwaysmandatoryfields = array_keys(ArtefactTypeProfile::get_always_mandatory_fields());
     foreach(ArtefactTypeProfile::get_mandatory_fields() as $field => $type) {
+        // Always mandatory fields are stored in the usr table, so are part of 
+        // the user session object. We can save a query by grabbing them from 
+        // the session.
+        if (in_array($field, $alwaysmandatoryfields) && $USER->get($field) != null) {
+            continue;
+        }
+        // Not cached? Get value the standard way.
         if (get_profile_field($USER->get('id'), $field) != null) {
             continue;
         }