Reorganize files in pglablib

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

pglablib/catalog/PgAmContainer.cpp

@@ -0,0 +1,17 @@
+#include "PgAmContainer.h"
+#include "Pgsql_Col.h"
+
+std::string PgAmContainer::getLoadQuery() const
+{
+	std::string q = "SELECT oid, amname FROM pg_am";
+	return q;
+}
+
+PgAm PgAmContainer::loadElem(const Pgsql::Row &row)
+{
+	Pgsql::Col col(row);
+	PgAm v;
+	col >> v.oid >> v.name;
+
+	return v;
+}