Make statistics reporting an opt-in option.
--- a/gui/babeldata.h
+++ b/gui/babeldata.h
@@ -64,7 +64,7 @@ public:
     upgradeOffers_(0),
     runCount_(0),
     startupVersionCheck_(true),
-    reportStatistics_(true),
+    reportStatistics_(false),
     allowBetaUpgrades_(false),
     ignoreVersionMismatch_(true),
     disableDonateDialog_(false),
