code: func NewPlaintextKeyStore(keydir string) *KeyStore {
  	keydir, _ = filepath.Abs(keydir)
  	ks := &KeyStore{storage: &keyStorePlain{keydir}}
  	ks.init(keydir)
  	return ks
  }
docs: // NewPlaintextKeyStore creates a keystore for the given directory.
  // Deprecated: Use NewKeyStore.