Mobius Caley form, Mobius Zolotarev operators. Pass Even Odd vs unprec test and hermiticity checks

in tests/Grid_any_evenodd.cc; will work on inversion tests shortly.

lib/qcd/action/fermion/MobiusZolotarevFermion.h

@@ -0,0 +1,48 @@
+#ifndef  GRID_QCD_MOBIUS_ZOLOTAREV_FERMION_H
+#define  GRID_QCD_MOBIUS_ZOLOTAREV_FERMION_H
+
+#include <Grid.h>
+
+namespace Grid {
+
+  namespace QCD {
+
+    class MobiusZolotarevFermion : public CayleyFermion5D
+    {
+    public:
+
+      // Constructors
+       MobiusZolotarevFermion(LatticeGaugeField &_Umu,
+			      GridCartesian         &FiveDimGrid,
+			      GridRedBlackCartesian &FiveDimRedBlackGrid,
+			      GridCartesian         &FourDimGrid,
+			      GridRedBlackCartesian &FourDimRedBlackGrid,
+			      RealD _mass,RealD _M5,
+			      RealD b, RealD c,
+			      RealD lo, RealD hi) : 
+      
+      CayleyFermion5D(_Umu,
+		      FiveDimGrid,
+		      FiveDimRedBlackGrid,
+		      FourDimGrid,
+		      FourDimRedBlackGrid,_mass,_M5)
+
+      {
+	RealD eps = lo/hi;
+
+	Approx::zolotarev_data *zdata = Approx::grid_zolotarev(eps,this->Ls,0);// eps is ignored for higham
+	assert(zdata->n==this->Ls);
+
+	std::cout << "MobiusZolotarevFermion (b="<<b<<",c="<<c<<") with Ls= "<<Ls<<" Zolotarev range ["<<lo<<","<<hi<<"]"<<std::endl;
+	
+	// Call base setter
+	this->CayleyFermion5D::SetCoefficients(1.0,zdata,b,c);
+ 
+      }
+
+    };
+
+  }
+}
+
+#endif