Added list of databases and roles.

Roles works for atleast 9.3 and up.

Reorganizing code for communicating with database.

src/RolesTableModel.h

@@ -0,0 +1,39 @@
+#ifndef ROLESTABLEMODEL_H
+#define ROLESTABLEMODEL_H
+
+
+#include <QAbstractTableModel>
+
+class PgAuthIdContainer;
+
+/** Class for displaying the list of roles of a server in a QTableView
+ *
+ */
+class RolesTableModel : public QAbstractTableModel {
+	Q_OBJECT
+public:
+	enum e_Columns : int { NameCol, SuperCol, InheritCol, CreateRoleCol,
+						 CreateDBCol, CanLoginCol, ReplicationCol,
+						 BypassRlsCol, ConnlimitCol, ValidUntilCol };
+
+
+
+	explicit RolesTableModel(QObject *parent);
+
+	void setRoleList(const PgAuthIdContainer* roles);
+
+	// Header:
+	QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+
+	// Basic functionality:
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+
+	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+private:
+	const PgAuthIdContainer *m_roles = nullptr;
+};
+
+
+#endif // ROLESTABLEMODEL_H