Sample program completed; run sim, write .clone.h5

The training_adapter no longer manages the sweep. The interface function
update_phase_point has been changed such that it accepts concrete phase
space points, rather than generating them from the sweep policy. The
sweep_policy is only used in the sample program and consumed to generate
all the phase space points.

Resuming simulation from the checkpoint in the sample program works now.

The learn program has been stripped down to its SVM optimization part;
no sampling takes place there.