PgAttribute loading + ColummnTableModel

Required enchancement to PgContainer to make multifield key work.

pglab/PgNamespaceContainer.h

@@ -0,0 +1,24 @@
+#ifndef PGNAMESPACECONTAINER_H
+#define PGNAMESPACECONTAINER_H
+
+#include "PgNamespace.h"
+#include "PgContainer.h"
+
+namespace Pgsql {
+
+	class Result;
+
+}
+
+class PgNamespaceContainer: public PgContainer<PgNamespace> {
+public:
+	using PgContainer<PgNamespace>::PgContainer;
+
+	virtual std::string getLoadQuery() const override;
+	virtual void load(const Pgsql::Result &res) override;
+
+private:
+};
+
+
+#endif // PGNAMESPACECONTAINER_H