Simple file versioning (fixes #218)

model/tempname.go

@@ -23,11 +23,3 @@ func (t tempNamer) TempName(name string) string {
 	tname := fmt.Sprintf("%s.%s", t.prefix, filepath.Base(name))
 	return filepath.Join(tdir, tname)
 }
-
-func (t tempNamer) Hide(path string) error {
-	return nil
-}
-
-func (t tempNamer) Show(path string) error {
-	return nil
-}