-ALSA interface
-Remove dependency on sox for saypho and bulktalk.
-Filters: consider adding a dictionnary-based filter for full word matches.
-Filter non-printables properly.
    Préfiltrage: ttp.PhonetizeError: Char unmatched <«> 171
-Roman numbers filter.
-Volume and speed controls.
-Trace calls: disabling tracing just throws away debugging strings instead of
   printing them, but we still waste a lot of effort preparing those strings.
-Chunking in phonetizer is somewhat crude...
-MBROLA output estimation: improve heuristic, timeout to save us if
   we guess wrong.
-Use very long text as a reference to see impact of new rules.
-Make a regression example text file for numbers.
-Improve text preparation.
-Less crude config file.
-FIXME's...
-User dictionnary.
-Bridge with more standard speech APIs.
