add human-readable studygroup names for CSV headings if option is enabled in admin page

booking.admin.inc

@@ -232,6 +232,14 @@ function booking_admin()
     '#default_value' => variable_get('booking_publish_readinggroups', 0)
   );
 
+  $form['features']['booking_friendly_csv_groupnames'] = array(
+    '#type' => 'radios',
+    '#title' => t('Use human-friendly study group names in CSV export?'),
+    '#description' => t('Select whether to use descriptions for study group columns when exporting CSV. If No, internal database field names are used.'),
+    '#options' => array(0 => t('No'), t('Yes')),
+    '#default_value' => variable_get('booking_friendly_csv_groupnames', 0),
+  );  
+  
   $form['misc'] = array(
     '#type' => 'fieldset',
     '#title' => 'Configuration Options'

booking.reports.inc

@@ -677,7 +677,7 @@ function booking_csv_report() {
 		}
 	
 		//Replace headings for study group sessions and roles with the name of the study group rather than just sessionN and sessionN_role etc
-		if (array_key_exists($key, $studygroup_descriptions)) {
+		if (variable_get('booking_friendly_csv_groupnames','0') == 1 && array_key_exists($key, $studygroup_descriptions)) {
 			$header_array[] = $studygroup_descriptions[$key];
 			continue;
 		}