fix memory leak reported at https://redmine.cbm.gsi.de/issues/2570.

Extend suggestions of PAL. Move MR from the mCBM fork to cbmroot master.

PAl edit: Refs #2570

reco/base/CbmRecoUnpackAlgo.tmpl

@@ -253,6 +253,12 @@ protected:
   */
   virtual bool unpack(const fles::Timeslice* ts, std::uint16_t icomp, UInt_t imslice) = 0;
 
+  /**
+   * @brief Use this function to implement additional actions to be called to finalize component if necessary.
+            (e.g. copy from temp buffers)
+  */
+  virtual void FinalizeComponent() { return; };
+
 public:
   // Runtime functions
 
@@ -433,6 +439,9 @@ public:
       }
     }
 
+    /// Give opportunity to finalize component (e.g. copy from temp buffers) if necessary
+    FinalizeComponent();
+
     auto ndigis = fOutputVec.size();
     fNrCreatedDigis += ndigis;