Documentation and refactoring
ref #6903 removed unused TermCacher
ref #6804 sort available distributions
ref #6903 TermCacher reorganisation
ref #6903 preload status from preferences in dialog
Fix service handling and refresh problem for distribution table
ref #5285 SpringUI configuration working
ref #5458 performance tweak for distribution status selection
ref #5458 Add support for setting distribution status filter in settings
ref #5458 Error handling for abbreviated labels
ref #5458 Reduce size of distribution table
ref #5458 Add TermCacher class
ref #5458 Major performance increase