Tested by doubling lattice in t-direction.
Interface in FermionOperator will change a lot in future
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.
Have 5d replicated wilson with 4d gauge working and matrix regressing to Ls copies of wilson.