Add documentation to TransitionMatrix comparison operator

   * (default is "LEGACY").

   */

  void write_binary(std::string file_name, std::string mode="LEGACY");

  /*! \brief Test whether two instances of TransitionMatrix are equal.

   *

   * Transition matrixes can be the result of a calculation or of a file input operation,

   * reading from a previously computed object. The `==` operator tests for the equivalence

   * of two transition matrixes, returning `true` if they are equivalnet, `false` otherwise.

   *

   * \param other: `TransitionMatrix &` Reference to the instance to be compared with.

   * \return result: `bool` True, if the two instances are equal, false otherwise.

   */

  bool operator ==(TransitionMatrix &other);

};

#endif