Added replay methods to attach to atomistic methods relaxation.
Reset (totally reset the hessian after each parent call)
ml_only (reinitialize hessian with all the points using current ml on each one after parent call)
parent_only (reinitialize hessian with only the parent calls)
mixed (default, reinitialize hessian with parent calls and current ml everywhere else, previously the only implementation)
Also fixed a bug associated with using the ml reinitialization and delta learner
Added replay methods to attach to atomistic methods relaxation. Reset (totally reset the hessian after each parent call) ml_only (reinitialize hessian with all the points using current ml on each one after parent call) parent_only (reinitialize hessian with only the parent calls) mixed (default, reinitialize hessian with parent calls and current ml everywhere else, previously the only implementation)
Also fixed a bug associated with using the ml reinitialization and delta learner