removed unused enum DotExportPropertyTokens

src/main/java/kieker/analysis/trace/graphoutput/DotTraceStyleStage.java

 package kieker.analysis.trace.graphoutput;
 
-import java.util.HashMap;
-import java.util.Map;
-
 import kieker.analysis.util.graph.Graph;
-import kieker.analysis.util.graph.export.dot.DotExportPropertyTokens;
 
 import teetime.stage.basic.AbstractTransformation;
 
 public class DotTraceStyleStage extends AbstractTransformation<Graph, Graph> {
 
-	private final Map<String, String> nodeStyling = new HashMap<>();
+	// private final Map<String, String> nodeStyling = new HashMap<>();
 
 	public DotTraceStyleStage() {
 		super();
-		nodeStyling.put("shape", "none");
+		// nodeStyling.put("shape", "none"); // TODO add
 	}
 
 	@Override
 	protected void execute(final Graph graph) {
-		graph.setProperty(DotExportPropertyTokens.DEFAULT_NODE_PROPERTIES, nodeStyling);
+		// graph.setProperty(DotExportPropertyTokens.DEFAULT_NODE_PROPERTIES, nodeStyling);
 		this.getOutputPort().send(graph);
 	}
 

src/main/java/kieker/analysis/util/graph/export/dot/DotExportPropertyTokens.java

-package kieker.analysis.util.graph.export.dot;
-
-public final class DotExportPropertyTokens {
-
-	public static final String DEFAULT_NODE_PROPERTIES = "__DEFAULT_NODE_PROPERTIES";
-
-	public static final String DEFAULT_EDGE_PROPERTIES = "__DEFAULT_EDGE_PROPERTIES";
-
-}