Rework/global edit to enforce type templating of fermion operators.

Allows multi-precision work and paves the way for alternate BC's and such like
allowing for example G-parity which is important for K pipi programme.
In particular, can drive an extra flavour index into the fermion fields
using template types.

lib/tensors/Tensor_traits.h

@@ -202,7 +202,6 @@ namespace Grid {
     static const bool value = true;
   };
 
-
 }
 
 #endif