Reorganize files in pglablib

The enitities and containers of the catalog now go into catalog subfolder
Models go into model

pglablib/catalog/PgAmContainer.h

@@ -0,0 +1,18 @@
+#ifndef PGAMCONTAINER_H
+#define PGAMCONTAINER_H
+
+#include "PgContainer.h"
+#include "PgAm.h"
+#include "Pgsql_declare.h"
+#include <vector>
+
+class PgAmContainer : public PgContainer<PgAm> {
+public:
+	using PgContainer<PgAm>::PgContainer;
+
+	virtual std::string getLoadQuery() const override;
+protected:
+	virtual PgAm loadElem(const Pgsql::Row &row) override;
+};
+
+#endif // PGAMCONTAINER_H