render gallery items

pdb-js/src/app/plot.service.ts

@@ -156,6 +156,10 @@ export class PlotRequest {
   yRangeUnit  : string;
   keyOutside : boolean = false;
   generateThumbnail : boolean;
+  
+  copy(): PlotRequest {
+    return JSON.parse(JSON.stringify(this));
+  }
 }
 
 export class PlotResponse {