Fixed memory leaks in SOGoSyncCacheObject and correctly kill the cache upon each EAS iteration

SoObjects/Mailer/SOGoMailBaseObject.m

@@ -43,10 +43,6 @@
 
 @implementation SOGoMailBaseObject
 
-#if 0
-static BOOL debugOn = YES;
-#endif
-
 - (id) initWithImap4URL: (NSURL *) _url
 	    inContainer: (id) _container
 {

SoObjects/SOGo/NSObject+Utilities.m

@@ -123,6 +123,9 @@
   return label;
 }
 
+//
+//  Set SOGoDebugLeaks = YES in your defaults to enable.
+//
 + (void) memoryStatistics
 {
   Class *classList = GSDebugAllocationClassList ();