Description of the Enhancement

Allow simulations to create checkpoints and later start from an existing checkpoint.

Justification for the Enhancement

The original matlab kwave binding allows one to specify a checkpoint time and a checkpoint file location. Should a simulation crash, the kwave executable can automatically pickup from it's last checkpoint.

This is super helpful for simulations that can take hours/days/weeks and one ideally does not want to have to restart such simulations from zero should their system go down for whatever reason.

Impact of Changes

Will require additional flags for simulation options and an update to the commandline interface.