Fix the 'return' keyword used with a custom keyword

src/org/graphstream/gama/extension/IKeywordGSAdditional.java

@@ -41,6 +41,7 @@ public class IKeywordGSAdditional implements IKeyword {
 	public static final String NODE_ID_TO = "gs_node_id_to";
 	public static final String PORT = "gs_port";
 	public static final String RECEIVERID = "gs_receiver_id";
+	public static final String RETURN = "gs_return";
 	public static final String SENDERID = "gs_sender_id";
 	public static final String STEP_NUMBER = "gs_step_number";
 }

src/org/graphstream/gama/extension/receiver/WaitStepStatement.java

@@ -21,7 +21,7 @@ import org.graphstream.gama.extension.IKeywordGSAdditional;
 @symbol(name = IKeywordGSAdditional.WAIT_STEP, kind = ISymbolKind.SINGLE_STATEMENT, with_sequence = false)
 @inside(kinds = { ISymbolKind.BEHAVIOR, ISymbolKind.SINGLE_STATEMENT })
 @facets(value = { @facet(name = IKeywordGSAdditional.RECEIVERID, type = IType.STRING, optional = false),
-		 @facet(name = IKeyword.RETURN, type = IType.NEW_TEMP_ID, optional = false)})
+		 @facet(name = IKeywordGSAdditional.RETURN, type = IType.NEW_TEMP_ID, optional = false)})
 public class WaitStepStatement extends AbstractStatement implements IStatement{
 	
 	final IExpression receiverid;
@@ -30,14 +30,14 @@ public class WaitStepStatement extends AbstractStatement implements IStatement{
 	public WaitStepStatement(IDescription desc) {
 		super(desc);
 		receiverid = getFacet(IKeywordGSAdditional.RECEIVERID);
-		returnVal = getLiteral(IKeyword.RETURN);
+		returnVal = getLiteral(IKeywordGSAdditional.RETURN);
 	}
 
 	@Override
 	protected Object privateExecuteIn(IScope scope) throws GamaRuntimeException {
 		String r = (String)(receiverid.value(scope));
 		GSReceiver receiver = GSManager.getReceiver(r);
-		Double step = receiver.waitStep();
+		Float step = new Float(receiver.waitStep());
 		// and we return the attribute list
 		scope.setVarValue(returnVal, step);
 		return step;