refs #661, improved model set dialog

* allow to change simulator
* consider distributor preferences for new model set
* error messages in dialog, therefor use CForm as base class

src/blackgui/components/simulatorselector.h

@@ -26,7 +26,7 @@ namespace BlackGui
     namespace Components
     {
         /*!
-         * Select simulator
+         * Select simulator (as radio buttons or checkboxes)
          */
         class BLACKGUI_EXPORT CSimulatorSelector : public QFrame
         {
@@ -67,6 +67,9 @@ namespace BlackGui
             //! All selected
             bool areAllSelected() const;
 
+            //! Set left margin
+            void setLeftMargin(int margin);
+
         signals:
             //! Value has been changed
             void changed(const BlackMisc::Simulation::CSimulatorInfo &simulator);