add: new logging categories
added relation handling
initial checkin
add: handling of relations
initial checkin
refactoring: prevent instantiation
add: check that not both parameters are constants
add: helpers for getting parameters, i.e. fv or f
refactoring: cleanup of raeh
add: toBigDecimalValue()
chg: brand new Comparation of Feature-Values
chg: improved tests
add: comparison of lists vs. lists
chg: minor refactoring
add: datasource, resolvers and validators configurable via property
add: datasource and resolvers configurable via properties
add: relation handling