nls: add four sequences for the Samogitian E with dot above and macron

Benno Schulenberg requested to merge benno/libx11:samogitian into master

These sequences each produce two code points: the E-with-dot-above and a combining macron. The XIM input method is required for this to work.

(Also add a missing comment for a Unicode block.)

This fixes issue #54 (closed).

Requested-by: Arns Udovīčė

Signed-off-by: Benno Schulenberg

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