made regionmodel iteration robust to handle 'delete this' from children.
made regionmodel iteration robust to handle 'delete this' from children.

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