/*
   * Create an empty repository, optionally with a name.
   *
   * This repository should then be populated with Solvables.
   *
   * Equivalent to: Repo.new
   *
   * call-seq:
   *  pool.create_repo -> Repo
   *  pool.create_repo("test") -> Repo
   *
   */
  Repo *create_repo( const char *name = NULL )