Allow restart from conditions in a prior simulation

[dbhart]

Sansmic should allow, particularly with HDF storage, the initialization of the simulation based on conditions and geometry from a previous simulation. This should be accomplished by using the results at the specified time to fill the arrays during the sansmic::Model::configure call. This will require changes to the C++ module:

1. Ability to modify certain arrays from the python code that are not currently exposed through the pybind11 module.
2. Verification that all results needed to restart the simulation are contained in the Results objects.