Added several knobs to control QoR in &nf.

src/aig/gia/giaNf.c

@@ -1228,9 +1228,7 @@ static inline word Nf_CutRequired( Nf_Man_t * p, Nf_Mat_t * pM, int * pCutSet )
 {
     Mio_Cell2_t * pCell = Nf_ManCell( p, pM->Gate );
     int * pCut = Nf_CutFromHandle( pCutSet, pM->CutH );
-    int * pFans  = Nf_CutLeaves(pCut);
-    int i, nFans = Nf_CutSize(pCut);
-    int iVar, fCompl;
+    int i, iVar, fCompl;
     word Arr, Req, Arrival = 0, Required = 0;
     Nf_CutForEachVarCompl( pCut, pM->Cfg, iVar, fCompl, i )
     {