Added dependants tab to table page

Retrieves all foreignkeys pointing to the current table
and shows the tables they are foreignkeys of.

pglab/DependantsPage.h

@@ -0,0 +1,30 @@
+#ifndef DEPENDENTSPAGE_H
+#define DEPENDENTSPAGE_H
+
+#include "widgets/CatalogPageBase.h"
+
+class PgClass;
+class DependantsTableModel;
+class QItemSelection;
+
+class DependantsPage : public CatalogPageBase {
+	Q_OBJECT
+public:
+	explicit DependantsPage(QWidget *parent = nullptr);
+
+	void setFilter(const std::optional<PgClass> &cls);
+signals:
+
+public slots:
+
+protected:
+	void catalogSet() override;
+private:
+	DependantsTableModel *m_model = nullptr;
+
+private slots:
+//	void tableView_selectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
+};
+
+
+#endif // DEPENDENTSPAGE_H