Function SCIPflushNLP 

pub unsafe extern "C" fn SCIPflushNLP(scip: *mut SCIP) -> SCIP_RETCODE

makes sure that the NLP of the current node is flushed

@pre This method can be called if SCIP is in one of the following stages: - \ref SCIP_STAGE_INITSOLVE - \ref SCIP_STAGE_SOLVING