Allow downloading posts from the toolbar

This allows downloading if the QML area is not filled.

TODO: Configure infinite scrolling

src/model/danboorupoolmodel.h

@@ -42,6 +42,7 @@ public:
     void clear();
     DanbooruPool* poolAt(int index) const;
 
+
 private:
     QVector<DanbooruPool *> m_items;
     static const QStringList m_headerNames;