Domain wall fermions now invert ; have the basis set up for

Tanh/Zolo * (Cayley/PartFrac/ContFrac) * (Mobius/Shamir/Wilson)
Approx        Representation               Kernel.

All are done with space-time taking part in checkerboarding, Ls uncheckerboarded

Have only so far tested the Domain Wall limit of mobius, and at that only checked
that it
i)  Inverts
ii) 5dim DW == Ls copies of 4dim D2
iii) MeeInv Mee == 1
iv) Meo+Mee+Moe+Moo == M unprec.
v) MpcDagMpc is hermitan
vi) Mdag is the adjoint of M between stochastic vectors.

That said, the RB schur solve, RB MpcDagMpc solve, Unprec solve
all converge and the true residual becomes small; so pretty good tests.

lib/qcd/action/fermion/WilsonFermion.cc

@@ -9,9 +9,9 @@ const std::vector<int> WilsonFermion::displacements({1,1,1,1,-1,-1,-1,-1});
 int WilsonFermion::HandOptDslash;
 
 WilsonFermion::WilsonFermion(LatticeGaugeField &_Umu,
-			   GridCartesian         &Fgrid,
-			   GridRedBlackCartesian &Hgrid, 
-			   double _mass) :
+			     GridCartesian         &Fgrid,
+			     GridRedBlackCartesian &Hgrid, 
+			     RealD _mass) :
   _grid(&Fgrid),
   _cbgrid(&Hgrid),
   Stencil    (&Fgrid,npoint,Even,directions,displacements),