better restoken handling by end of list

oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDeliverer.java

@@ -269,7 +269,7 @@ public class RecordListDeliverer {
 	            	cursor = cursorCollector.get(resumptionToken).intValue() + i;
 	            	resTokenForResponse.setCursor(BigInteger.valueOf((long) cursor));
 	            	cursorCollector.put(scrollResp.getScrollId(), cursor);
-	            	cursorCollector.remove(resumptionToken);
+	            	//cursorCollector.remove(resumptionToken);
 	            	
 	            }else {
 	            	resTokenForResponse.setCursor(BigInteger.valueOf(searchResponseSize));