doEvent.checkpoint(sim, eventTime, eventType, debug = FALSE)
checkpointLoad(file)
.checkpointSave(sim, file)simList simulation object."init", "load", or "save".debug = FALSE).simList object.
checkpointLoad and .checkpointSave code based on:
https://raw.githubusercontent.com/achubaty/r-tools/master/checkpoint.RRNG save code adapted from: http://www.cookbook-r.com/Numbers/Saving_the_state_of_the_random_number_generator/ and https://stackoverflow.com/questions/13997444/
.Random.seed.