Query can be edited. Project database can be exported

User can now define the information to display in the nomenclature
table. WIP
The internal database of project can be exported to file.

sources/qetgraphicsitem/ViewItem/nomenclaturemodel.h

@@ -42,6 +42,7 @@ class NomenclatureModel : public QAbstractTableModel
 		bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
 		QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
 		void query(const QString &query);
+		QETProject *project() const;
 
 	private:
 		void dataBaseUpdated();