switched to 'retrieve' as the property for a bitstream's file url

src/app/core/shared/bitstream.model.ts

@@ -9,11 +9,6 @@ export class Bitstream extends DSpaceObject {
    */
   size: number;
 
-  /**
-   * The relative path to this Bitstream's file
-   */
-  url: string;
-
   /**
    * The mime type of this Bitstream
    */
@@ -40,7 +35,7 @@ export class Bitstream extends DSpaceObject {
   owner: RemoteData<Item>;
 
   /**
-   * The Bundle that owns this Bitstream
+   * The URL to retrieve this Bitstream's file
    */
   retrieve: string;