Unify place queries, remove variant parameter

src/client/actions/index.js

src/client/components/facet_results/Deck.js

src/client/components/facet_results/LeafletMap.js

src/client/components/facet_results/Pie.js

src/client/components/perspectives/Actors.js

src/client/components/perspectives/Manuscripts.js

src/client/components/perspectives/Places.js

src/client/epics/index.js

src/client/reducers/helpers.js

src/client/reducers/places.js

src/server/index.js

src/server/sparql/FacetResults.js

src/server/sparql/Mappers.js

src/server/sparql/SparqlQueriesActors.js

src/server/sparql/SparqlQueriesGeneral.js

src/server/sparql/SparqlQueriesManuscripts.js

src/server/sparql/SparqlQueriesPlaces.js