remove file when project is removed

model/src/main/java/lcsb/mapviewer/model/Project.java

@@ -85,7 +85,7 @@ public class Project implements Serializable {
   private List<Layout> layouts = new ArrayList<>();
 
   @Cascade({ CascadeType.SAVE_UPDATE })
-  @OneToOne(fetch = FetchType.LAZY)
+  @OneToOne(fetch = FetchType.LAZY, orphanRemoval = true)
   @JoinColumn(name = "file_entry_id")
   private UploadedFileEntry inputData;