Moved FastText links from document to subpages

This paves the way for different FastText links per subpage.
Will also be some help when we come to splitting out document loading
and saving.

pageoptionsdockwidget.h

@@ -46,6 +46,7 @@ private:
 	QLineEdit *m_fastTextEdit[6];
 
 	void addRegionList(QComboBox *);
+	void setFastTextLinkPageNumber(int, const QString &);
 	void setDefaultRegion();
 	void setDefaultNOS();
 	void setSecondRegion();