RemoveContainer for` local` seems incorrect

https://github.com/graymeta/stow/blob/cacc23c0285416ac720e9f73cbe150d22c84bc2d/local/location.go#L30

I think the implementation should be similar to CreateContainer(name)
```
	path, ok := l.config.Config(ConfigKeyPath)
	if !ok {
		return nil, errors.New("missing " + ConfigKeyPath + " configuration")
	}
	fullpath := filepath.Join(path, name)
        return os.RemoveAll(fullpath)
```
