+ * added urgency column.
+ * implemented the cancel button of the task panel.
+ * added menu.
+ * restore position of vertical/horizaton spliters.
+ * added creation date, due, id, uuid, urgency, and start date in the
+ list of tasks.
+ * popup menu to filter columns of the table of tasks.
+ * allow to change the directory containing the notes.
+ * fixed compilation with gtk+ 3.10 (ignore deprecation of GtkAction).