[BRLTTY] Keypad bindings and copy buffer

[Dave Mielke]

The code is now written (but not committed). For it to work correctly, the 
timeout for a pending key release event needs to be a little more than twice 
the poll interval. That essentially means 90 milliseconds, which is just under 
a tenth of a second. It introduces a noticeable delay.

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Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
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