Improve advisor SPARQL query

[fnielsen]

This query might show a bit more. The query needs to be extended with P185

SELECT
  ?supervised ?supervisedLabel
  ?supervisor ?supervisorLabel
WITH {
  SELECT ?person WHERE {
    wd:Q20895785 wdt:P184+ ?person . 
  }
} AS %persons
WHERE {
  INCLUDE %persons
  {
    ?supervised wdt:P184 ?person .
    BIND(?person AS ?supervisor)
  }
  UNION 
  {
    ?person wdt:184 ?supervisor .
    BIND(?person AS ?supervised)
  }
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}

[carlinmack]

Superceded by #866