#179 Edit Datum OK in Data, not in Annotate

[Joseph E. Grimes]

In 2.1.0 test 2, the Edit Datum button on the Annotate
panel went dead. I can do alignments by double clicking
the Aligned column, but not using the button, and I
have no access to grapheme clusters. So I can't
continue testing.

[Nathan]

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user_id=1050693

fixed in 2.1.0 test 3