Prevent Invitations and whitelist GUI

UI/PreferencesUI/UIxPreferences.h

@@ -33,6 +33,7 @@
 {
   id item;
   SOGoUser *user;
+  SOGoUserSettings *us;
   NGSieveClient *client;
 
   // Addressbook

UI/PreferencesUI/UIxPreferences.m

@@ -41,6 +41,7 @@
 #import <SOGo/NSString+Utilities.h>
 #import <SOGo/SOGoUser.h>
 #import <SOGo/SOGoUserDefaults.h>
+#import <SOGo/SOGoUserSettings.h>
 #import <SOGo/SOGoDomainDefaults.h>
 #import <SOGo/SOGoSieveManager.h>
 #import <SOGo/SOGoSystemDefaults.h>
@@ -638,6 +639,23 @@ static NSArray *reminderValues = nil;
   return [userDefaults busyOffHours];
 }
 
+- (void) setPreventInvitations: (BOOL) preventInvitations
+{
+  SOGoUserSettings *us;
+  
+  us = [user userSettings];
+  [us setBool: preventInvitations forKey: @"PreventInvitations"];
+  [us synchronize];
+}
+
+- (BOOL) preventInvitations
+{
+  SOGoUserSettings *us;
+  us = [user userSettings];
+  
+  return [[us objectForKey: @"PreventInvitations"] boolValue];
+}
+
 - (NSArray *) firstWeekList
 {
   return [NSArray arrayWithObjects: