fix minor compiler warnings, add title and href to label facets
use title and hoverover for facets and support for string and decimal
placeholders in hoverover texts
implement generic hoverover texts for feedback/review facets
some improvements on tests, but still only running ITs manually
fix drilldown URL for producer comments facet
fix for some variable that were not mapped to the internal model anymore
since the hovertexts are now generated without the model;
also: reorganize tests, some test improvements
increase version number to 0.0.5