score class in the XML serialization #225

This PR includes the class information in the measure XML serialization, which changes from

  <measure id="influence" key="score" value="5.06690394631e-09"/>
  <measure id="popularity_alt" key="score" value="0.0"/>
  <measure id="popularity"  key="score" value="3.11855618382e-09"/>
  <measure id="influence_alt"  key="score" value="0.0"/>
  <measure id="impulse"  key="score" value="0.0"/>

to

  <measure id="influence" score="5.06690394631e-09" class="C"/>
  <measure id="popularity_alt" score="0.0" class="C"/>
  <measure id="popularity" score="3.11855618382e-09" class="C"/>
  <measure id="influence_alt" score="0.0" class="C"/>
  <measure id="impulse" score="0.0" class="C"/>

Note also that the attributes are renamed, I think the updated serialisation is simpler.

This PR includes the class information in the measure XML serialization, which changes from ``` <measure id="influence" key="score" value="5.06690394631e-09"/> <measure id="popularity_alt" key="score" value="0.0"/> <measure id="popularity" key="score" value="3.11855618382e-09"/> <measure id="influence_alt" key="score" value="0.0"/> <measure id="impulse" key="score" value="0.0"/> ``` to ``` <measure id="influence" score="5.06690394631e-09" class="C"/> <measure id="popularity_alt" score="0.0" class="C"/> <measure id="popularity" score="3.11855618382e-09" class="C"/> <measure id="influence_alt" score="0.0" class="C"/> <measure id="impulse" score="0.0" class="C"/> ``` Note also that the attributes are renamed, I think the updated serialisation is simpler.

I am not familiar with the exact input provided by BIP!Finder, but I think this PR is ok.

The PR is ok to me as well

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score class in the XML serialization #225

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