Example of multiple levels in the WilsonFermion hmc test.
Merge remote-tracking branch 'upstream/master'
Conflicts:
lib/qcd/hmc/HMC.h
lib/qcd/hmc/integrators/Integrator.h
lib/qcd/hmc/integrators/Integrator_algorithm.h
tests/Test_simd.cc
exp(-DeltaH) = 1 now, and plaquette is sensible. Will reproduce an old Wilson Gauge
Wilson Fermion SCRI plaquette with precision in mass matching shortly.