Added some class descriptions and Doxygen config.

connectionlistmodel.h

@@ -11,6 +11,10 @@
 #include "expected.h"
 
 
+/** \brief Model class for the list of connections.
+ *
+ * This class also allows for the editing of the list.
+ */
 class ConnectionListModel : public QAbstractListModel {
 	Q_OBJECT
 public:

explaintreemodelitem.h

@@ -21,6 +21,9 @@ typedef std::shared_ptr<ExplainTreeModelItem> ExplainTreeModelItemPtr;
  * 4. rows
  * 5. loops
  */
+
+/** \brief Model class for displaying the explain of a query in a tree like format.
+ */
 class ExplainTreeModelItem: public std::enable_shared_from_this<ExplainTreeModelItem> {
 public:
 	typedef std::shared_ptr<ExplainTreeModelItem> ItemPtr;

opendatabase.h

@@ -7,6 +7,9 @@
 
 class PgsqlDatabaseCatalogue;
 
+/** Instances of this class represent a single database on which atleast one
+ * window is opened. This class is used to track details about that database.
+ */
 class OpenDatabase : public QObject
 {
 	Q_OBJECT