issue #223: correctly detect if reversible data have to be removed after hived restart

• now fork event is added only when hived wills end notification, no artificial event during 'hive.connect'
• hive.connect is always executed before on_reindex notification, before data are marked as dirty

src/sql_serializer/livesync_data_dumper.cpp

@@ -155,7 +155,8 @@ namespace hive{ namespace plugins{ namespace sql_serializer {
   }
 
   void livesync_data_dumper::on_switch_fork( uint32_t block_num ) {
-    _processing_thread.enqueue("SELECT hive.back_from_fork(" + std::to_string(block_num) + ")");
+      ilog( "MICKIEWICZ FORK INSERTED: fork ${b}", ("b", block_num) );
+      _processing_thread.enqueue("SELECT hive.back_from_fork(" + std::to_string(block_num) + ")");
   }
 
   void livesync_data_dumper::connect_irreversible_event() {