#10 Add sentence detection to DAISY XML export

[Christophe Strobbe]

Some ussers of odt2daisy just export DAISY XML instead of Full DAISY. This DAISY XML is then fed into a DAISY authoring tool such as Tobi (a tool by the DAISUY consortium), in order to create a DAISY book with recorded human speech instead of synthetic speech. However, the export to DAISY XML allows no sentence detection; they would like this to be added. (Word detection would also be nice, but that is a separate feature request.)