added EXPERIMENTAL warning to sim_init restart method
added EXPERIMENTAL warning to sim_init restart method

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