/// Construct a layout with default values. Actual values loaded later.
explicit LayoutFile(std::string const & filename,
std::string const & className = std::string(),
std::string const & description = std::string(),
/// Construct a layout with default values. Actual values loaded later.
explicit LayoutFile(std::string const & filename,
std::string const & className = std::string(),
std::string const & description = std::string(),