added BUFF_INFINITY macro const to be the new 'unlimited' capacity
added BUFF_INFINITY macro const to be the new 'unlimited' capacity

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