Updated work on routing by id.

Fixed unit tests.

Updated to use pid REST endpoint.

Minor change in data.service and unit test update.

Updated the objectnotfound page with new text and go home button.

src/app/core/cache/object-cache.reducer.ts

@@ -44,6 +44,7 @@ export abstract class TypedObject {
  */
 export class CacheableObject extends TypedObject {
   uuid?: string;
+  handle?: string;
   self: string;
   // isNew: boolean;
   // dirtyType: DirtyType;