added test for request pref -> arc preference access for a node
added test for request pref -> arc preference access for a node

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