- move data-directory back to default: /etc/brltty
    - move brltty to /bin and /lib, so that it can be used to repair the system
        without /usr mounted (#276181)
    - move vstp and libbrlttybba.so to brlapi
    - brltty no longer requires brlapi
    - brlapi now requires brltty from the same build
    - build the TTY driver (it was disabled since it first appered in 3.7.2-1)
    - build with speech-dispatcher, packed into a separate sub-package