Make statistics reporting an opt-in option.
--- a/gui/babeldata.h
+++ b/gui/babeldata.h
@@ -151,7 +151,7 @@ public:
 
   // Global preferences.
   bool startupVersionCheck_{true};
-  bool reportStatistics_{true};
+  bool reportStatistics_{false};
   bool allowBetaUpgrades_{false};
   bool ignoreVersionMismatch_{true};
   bool disableDonateDialog_{false};
