Dependance with natbraille

[Bruno Mascret <bmascret@free.fr>]

Dear all (especially Samuel ;)),

Thanks for adding natbraille in testing.
I found a dependance problem: natbraille needs libjoptsimple-java to 
work correctly.
Icons are not working with the gui. We should change the code to get 
standards icons but I have no idea on how to do that.

Another point: what can we do to ease the packaging process?

Thanks for your help and for Samuel's work!

Best regards,
Bruno