Parameter checking
fix: last commit generation of a lucene segement was not stored to database
Add new filter for value b on Fun.Tuple3
Refocatored document-frequency calculation
Remove all database references from AbstractIndexDataProvider
fix: Persistence not using database settings
add: support for transaction-less storage
fix: ConfigurationFile handling non existing file
fix: prevent div/0
Remove ad-hoc calculations from DirectIndexDataProvider. Use cache instead.
Remove wrong Tuple filter, fixed DocumentFrequency calculation