properly use TreeTagger settings in Dulko stylesheets

[nolda]

Fixes #407.

• add functions for TreeTagger abbrevations file to TreeTagger.java
• use TreeTagger settings for parameter and abbrevations files in exb2exb-word.xsl and exb2exb-tag.xsl
• throw an error if the language of the TreeTagger parameter and abbrevation files differ from the first language used in the speaker table