Reactor commodity preference change timestep comparison update#535

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opotowsky wants to merge 3 commits intocyclus:mainfrom opotowsky:pref-change-update

+240-1

Commits on Feb 14, 2022

alters the pref change timestep comparison so that reactors deployed after the change also get the new pref change scheme
opotowsky
committed

Commits on Feb 15, 2022

adding a basic pref change test
opotowsky
committed
since unit testing can't have a reactor enter the simulation late, testing the ability for the fuel pref change to be seen by a reactor that enters after the fuel time with an input file
opotowsky
committed