added include guards to solver factory
added include guards to solver factory

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