Computes r = generator * n + q * m
\param group underlying EC_GROUP object
\param r EC_POINT object for the result
\param n BIGNUM with the multiplier for the group generator (optional)
\param q EC_POINT object with the first factor of the second summand
\param m BIGNUM with the second factor of the second summand
\param ctx BN_CTX object (optional)
\return 1 on success and 0 if an error occured
Computes r = generator * n + q * m \param group underlying EC_GROUP object \param r EC_POINT object for the result \param n BIGNUM with the multiplier for the group generator (optional) \param q EC_POINT object with the first factor of the second summand \param m BIGNUM with the second factor of the second summand \param ctx BN_CTX object (optional) \return 1 on success and 0 if an error occured