Ref T164, show (by LED) when consolidating data

* added LED in info bar
* signal in background updater and
* connecting them

src/blackcore/db/backgrounddataupdater.h

@@ -28,6 +28,8 @@ namespace BlackCore
          */
         class BLACKCORE_EXPORT CBackgroundDataUpdater : public BlackMisc::CContinuousWorker
         {
+            Q_OBJECT
+
         public:
             //! Log categories
             static const BlackMisc::CLogCategoryList &getLogCategories();
@@ -35,6 +37,10 @@ namespace BlackCore
             //! Constructor
             CBackgroundDataUpdater(QObject *owner);
 
+        signals:
+            //! Consolidation
+            void consolidating(bool started);
+
         private:
             int    m_cycle = 0;      //!< cycle
             bool   m_inWork = false; //!< indicates a running update