Update learning_order.txt

Select words, then click Update learning_order.txt…

MorphMan writes them in learning_order.txt, in the order of the table. A manual Study Plan, from one title.

It replaces the file. At the next Recalc (Ctrl+M), the cards that teach these words come first.

To see what's in the file: the learning_order.txt tab. To write it from several titles at once: the Study Plan.