Added one flavour rational ratios (unprec)

lib/algorithms/approx/MultiShiftFunction.h

@@ -27,6 +27,8 @@ public:
     if ( inverse ) remez.getIPFE (&residues[0],&poles[0],&norm);
     else           remez.getPFE (&residues[0],&poles[0],&norm);
   }
+  // Allow deferred initialisation
+  MultiShiftFunction(void){};
   MultiShiftFunction(AlgRemez & remez,double tol,bool inverse)
   {
     Init(remez,tol,inverse);

lib/algorithms/iterative/ConjugateGradientMultiShift.h

@@ -27,10 +27,14 @@ public:
 
 void operator() (LinearOperatorBase<Field> &Linop, const Field &src, Field &psi)
 {
-
   GridBase *grid = src._grid;
   int nshift = shifts.order;
   std::vector<Field> results(nshift,grid);
+  (*this)(Linop,src,results,psi);
+}
+void operator() (LinearOperatorBase<Field> &Linop, const Field &src, std::vector<Field> &results, Field &psi)
+{
+  int nshift = shifts.order;
 
   (*this)(Linop,src,results);