added parameterless constructor for concordia

concordia/concordia.cpp

@@ -15,6 +15,9 @@ std::string Concordia::_libraryVersion = _createLibraryVersion();
 
 // ===========================================
 
+Concordia::Concordia() {
+}
+
 Concordia::Concordia(const std::string & indexPath,
                      const std::string & configFilePath)
                                          throw(ConcordiaException) :

concordia/concordia.hpp

@@ -37,6 +37,10 @@
 
 class Concordia {
 public:
+    /*! Parameterless constructor
+    */
+    Concordia();
+
     /*! Constructor.
       \param indexPath path to the index directory
       \param configFilePath path to the Concordia configuration file