* implemented the cancel button of the task panel.
* added menu.
* restore position of vertical/horizaton spliters.
- * added creation date, due, and start date in the list of tasks.
+ * 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.
v0.0.4
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