No standard progenitor distance for files saved by IO module

[rcross2]

Current operations to save a processed simulation is:

E_per_V_1kpc =  E_per_V * ccsn.progenitor_distance.to(u.kpc).value**2
io.save(conf, Interactions, Hierarchy, Flavor, Enu.value, time.value, \
                                    E_per_V_1kpc, force=True)

IO module should do the conversion to 1kpc so that data files are at a standard distance.

[sgriswol]

As of #52 this can now be handled by the SimulationHandler class.
Example:

from asteria.handler import SimulationHandler

conf = config.load_config('path-to-asteria/data/config/default.yaml')
sim = SimulationHandler(conf)
sim.load()
sim.E_per_V 

This assumes a simulation has already been saved.
sim.save() will scale the energy deposition per volume to a progenitor at 1kpc, and then save the result to file.
sim.load() will load the scaled energy deposition per volume and re-scale it to the distance specified by the source.progenitor.distance.distance node of the conf object.