* Refactored the Text-To-SSML XProc in order to easily plug XProcSpec tests to it;
* Fixed a bug that made some CSS cues and pauses ignored ;
* Fixed a bug that was responsible for duplicating some SSML nodes ;
* More flexible use of the voice-family CSS property ;
* Removed a useless reference to a document-id that did not make sense anymore because the generated thread ID are no longer kept.