ref #8568: performance issues for term and voc preference pages
ref #8489: code cleaning
ref #8385: better handling of distr preferences and term related preferences
ref #8389: fix NPE and smaller issues in preferences
ref #8385: adapt strucutre of db prefs to local prefs
ref #6794 adapt TaxEditor to new term structure (rename FeatureNode and FeatureTree)
ref #8045: further implementation for default/explicit value selection preference pages