Function SCIPaggrRowCreate 

pub unsafe extern "C" fn SCIPaggrRowCreate(
    scip: *mut SCIP,
    aggrrow: *mut *mut SCIP_AGGRROW,
) -> SCIP_RETCODE

create an empty aggregation row

@note By default, this data structure uses quad precision via double-double arithmetic, i.e., it allocates a SCIP_Real array of length two times SCIPgetNVars() for storing the coefficients. In exact solving mode, we cannot use quad precision because we need to control the ronding mode, hence only the first SCIPgetNVars() entries are used.