refs #641, improvements/fixes of orderable lists / models / views

* set sort order automatically to IndexOrder when changing order of items
* call onChanged when model is changed and then update view (needed when model is changed directly, not via view)
* support for digest signal so redundant updates can be avoided
* renamed rowCountChanged (signal) to modelDataChanged - detecting row count changes only was useless
* updated Doxygen / fixed typos

src/blackmisc/orderablelist.h

@@ -18,6 +18,7 @@
 namespace BlackMisc
 {
     //! List of orderable IOrderable objects
+    //! \remark Orerable objects shall implement BlackMisc::IOrderable
     template<class OBJ, class CONTAINER>
     class IOrderableList
     {
@@ -71,8 +72,8 @@ namespace BlackMisc
 
     extern template class BLACKMISC_EXPORT_TEMPLATE IOrderableList<BlackMisc::Simulation::CAircraftModel, BlackMisc::Simulation::CAircraftModelList>;
     extern template class BLACKMISC_EXPORT_TEMPLATE IOrderableList<BlackMisc::Simulation::CDistributor, BlackMisc::Simulation::CDistributorList>;
-
     //! \endcond
+
 } //namespace
 
 #endif //guard