code: func (config *Config) StringFromSection(sectionName string, key string, def string) string {
  	section := config.sectionForName(sectionName)
  
  	if section != nil {
  		return getString(section.values, key, def)
  	}
  
  	return def
  }
docs: /*
  StringFromSection looks for the specified key and returns it as a string. If not found the default value def is returned.
  
  If the section name matches the config.name or "" the global data is searched.
  */