Cache redesign part 1, and add support for alternative links

src/app/core/tasks/models/process-task-response.ts

@@ -1,13 +1,11 @@
-import { RemoteDataError } from '../../data/remote-data-error';
-
 /**
  * A class to represent the data retrieved by after processing a task
  */
 export class ProcessTaskResponse {
   constructor(
     private isSuccessful: boolean,
-    public error?: RemoteDataError,
-    public payload?: any
+    public statusCode?: number,
+    public errorMessage?: string
   ) {
   }