One flavour rational unprec added; untested but does compile.

Moving param structs into a single header for later connection to file I/O using
macromagic.h

lib/qcd/action/ActionParams.h

@@ -0,0 +1,26 @@
+#ifndef GRID_QCD_ACTION_PARAMS_H
+#define GRID_QCD_ACTION_PARAMS_H
+
+namespace Grid {
+namespace QCD {
+
+    // These can move into a params header and be given MacroMagic serialisation
+    struct GparityWilsonImplParams {
+      std::vector<int> twists; 
+    };
+
+    struct WilsonImplParams { };
+
+    struct OneFlavourRationalParams { 
+      RealD  lo;
+      RealD  hi;
+      int precision=64;
+      int    degree=10;
+      RealD tolerance; // Vector? 
+      RealD MaxIter;   // Vector?
+      OneFlavourRationalParams (RealD lo,RealD hi,int precision=64,int degree = 10);
+    };
+
+}}
+
+#endif