Implemented camp wizard and service methods for camp calculation.

camp/data/sale.h

@@ -4,9 +4,10 @@
 #include <QObject>
 #include <odb/core.hxx>
 #include <QDecDouble.hh>
+#include <combodata.h>
 
 #pragma db object
-class Sale : public QObject
+class Sale : public ComboItem
 {
     Q_OBJECT
     Q_PROPERTY(QString description READ description WRITE setDescription)
@@ -35,6 +36,11 @@ private:
     QString m_description;
     int m_sale;
     bool m_fixed;
+
+    // ComboItem interface
+public:
+    bool eq(ComboItem *other);
+    QString toString();
 };
 
 #endif // SALE_H