added note about relationship between init, restart, and snapshot methods
added note about relationship between init, restart, and snapshot methods

mbmcgarry/cyclus,hodger/cyclus,rwcarlsen/cyclus,Baaaaam/cyclus,gidden/cyclus,hodger/cyclus,mbmcgarry/cyclus,rwcarlsen/cyclus,rwcarlsen/cyclus,Baaaaam/cyclus,mbmcgarry/cyclus,rwcarlsen/cyclus,gidden/cyclus,gidden/cyclus,Baaaaam/cyclus,hodger/cyclus,hodger/cyclus,hodger/cyclus,mbmcgarry/cyclus,gidden/cyclus