Delay saving session statistics

Pausing the libtorrent session should be scheduled before this.

src/base/bittorrent/sessionimpl.cpp

@@ -1030,11 +1030,12 @@ void SessionImpl::setGlobalMaxSeedingMinutes(int minutes)
 // Main destructor
 SessionImpl::~SessionImpl()
 {
-    saveStatistics();
-
-    // Do some BT related saving
+    // Do some bittorrent related saving
+    // After this, (ideally) no more important alerts will be generated/handled
     saveResumeData();
 
+    saveStatistics();
+
     // We must delete FilterParserThread
     // before we delete lt::session
     delete m_filterParser;