usermanagment.go
func (c *Client) ListUsers() (*Users, error) {
	url := umUsers() + `?depth=` + c.client.depth + `&pretty=` + strconv.FormatBool(c.client.pretty)
	ret := &Users{}
	err := c.client.Get(url, ret, http.StatusOK)
	return ret, err
}
func (c *Client) ListUsers() (*Users, error) {
	url := umUsers() + `?depth=` + c.client.depth + `&pretty=` + strconv.FormatBool(c.client.pretty)
	ret := &Users{}
	err := c.client.Get(url, ret, http.StatusOK)
	return ret, err
}
//ListUsers lists all users