/*
   * Write Repo to .+solv+ file
   *
   * If +basename+ is given, write languages, DU information and
   * filelists to separate files (<basename>.{<lang>,DU,FL}.solv)
   * If +attrname+ is given, write attributes to separate file (<attrname>)
   */
  void write( FILE *READ, const char *basename = NULL, const char *attrname = NULL )