[BRLTTY] Improving the speech support of brltty

[Dave Mielke]

KPPlus+KP8 is now speak current line. Spell current word has been moved to 
KPSlash, and KPAsterisk now describes the current character.

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Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | 2011 May 21 is the End of Salvation.
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