Distinguishing of frequency thresholds in refinement operator

[LorenzBuehmann]

Currently, there is only one option to set the frequency threshold of properties values used e.g. in hasValue hypotheses, i.e. we cannot set different values for the values of object properties (OWL individuals) and data properties (OWL literals).

Suggestion:

frequencyThreshold =>

1. dataHasValueFrequencyThreshold
2. objectHasValueFrequencyThreshold

or something else

Important: We have to adapt examples/conf files too after renaming was done