make GridVisualizer event background lighter
first code for not outputting unused token in GridVisualizer (does not work yet...)
Merge branch 'refs/heads/master' into #98
actual use STextualDS ID instead of the STextualRelation...
use an token index offset to adjust left/right when triggered text is not the first one
for results with only one text: show old behavior (show all tokens) when no annotation was found
Merge pull request #101 from thomaskrause/#98

fix #98 (Grid is broken in parallel corpora)