[BRLTTY] Technibraille alize 64 + debian 9

[Shérab]

Hi Pierre,

Before trying to configure the service, perhaps it would be better to
try and run brltty manually. That way, you can try different parameters
quickly, debug etc. You could even do that by yourself: plug your other
(working) terminal and then you will be able to debug the brltty that is
supposed to run the technibraille driver.

Once you are sure about the parameters you can go ahead and modify the
service's configuration.

Shérab.