improved archive: storage dir cannow be configured. also, mails are now displayed in send-time order

src/main/java/de/srsoftware/widerhall/web/Rest.java

@@ -9,19 +9,15 @@ import org.json.simple.JSONObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.mail.MessagingException;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
-import java.io.Serializable;
-import java.io.UnsupportedEncodingException;
 import java.sql.SQLException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 
 import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Util.t;
@@ -148,17 +144,17 @@ public class Rest extends HttpServlet {
         }
     }
 
-    private Map<Long, Object> archive(HttpServletRequest req) {
+    private List<? extends Object> archive(HttpServletRequest req) {
         var list = Util.getMailingList(req);
         if (list != null){
             try {
-                return Post.find(list).stream().collect(Collectors.toMap(Post::timestamp,Post::safeMap));
+                return Post.find(list).stream().map(Post::safeMap).toList();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         LOG.debug("list: {}",list.email());
-        return Map.of();
+        return List.of();
     }
 
     public String handlePost(HttpServletRequest req, HttpServletResponse resp){