SSSOM-Java 0.7.1

This is a bugfix release.

The documentation of the SSSOM/T-OWL dialect used by the inject ROBOT command states that all axiom-generating functions accept an optional argument describing how to annotate the generated axioms, but this was not true for the direct() function, which accepted no such argument.

The only change from version 0.7.0 is that the direct() function now accepts the same optional argument as all the other axiom-generating functions. The default behaviour, when the function is called without argument, is still to generate direct axiom annotations for all the mapping metadata except mapping_cardinality.