Function esl_msa_AddGS 

pub unsafe extern "C" fn esl_msa_AddGS(
    msa: *mut ESL_MSA,
    tag: *mut c_char,
    taglen: esl_pos_t,
    sqidx: c_int,
    value: *mut c_char,
    vlen: esl_pos_t,
) -> c_int