add skeleton for MusrRoot which will handle TDirectoryFile rather than TFolder.

src/external/MusrRoot/TMusrRunHeader.cpp

@@ -395,6 +395,23 @@ Bool_t TMusrRunHeader::FillFolder(TFolder *folder)
   return true;
 }
 
+//--------------------------------------------------------------------------
+// FillDirectory (public)
+//--------------------------------------------------------------------------
+/**
+ * <p>Fills the RunHeader directory. This is needed to write it to a ROOT file.
+ * It walks through all information and attaches it to the directory or replaces
+ * it, if it is already present.
+ *
+ * \param dir to be filled
+ */
+Bool_t TMusrRunHeader::FillDirectory(TDirectoryFile *dir)
+{
+  // NOT YET IMPLEMENTED
+
+  return true;
+}
+
 //--------------------------------------------------------------------------
 // GetTypeOfPath (public)
 //--------------------------------------------------------------------------
@@ -873,6 +890,22 @@ Bool_t TMusrRunHeader::ExtractAll(TFolder *folder)
   return true;
 }
 
+//--------------------------------------------------------------------------
+// ExtractAll (public)
+//--------------------------------------------------------------------------
+/**
+ * <p>Reads all data from an open ROOT-file structure and feeds all the necessary
+ * internal data objects.
+ *
+ * \param dir
+ */
+Bool_t TMusrRunHeader::ExtractAll(TDirectoryFile *dir)
+{
+  // NOT YET IMPLEMENTED
+
+  return true;
+}
+
 //--------------------------------------------------------------------------
 // ExtractHeaderInformation (public)
 //--------------------------------------------------------------------------