func NewFilename(id uint64, dir string) string {
	return filepath.Join(dir, IDToFilename(id))
}
func NewFilename(id uint64, dir string) string {
	return filepath.Join(dir, IDToFilename(id))
}
func NewFilename ( id uint64 , dir string ) string { return filepath . Join ( dir , IDToFilename ( id ) ) }
// NewFilename should be named TableFilepath -- it combines the dir with the ID to make a table
// filepath.
NewFilename should be named TableFilepath -- it combines the dir with the ID to make a table filepath .