Fixes to map RadiationRedshift* parameters to Grackle #81
This is a quick fix to make Enzo to be fully functional with all of Grackle’s features. (Previously these four Enzo parameters were not mapped to their respective Grackle parameters.) This fix -- identified by myself (Ji-hoon) and Britton -- will also make Enzo to be fully compatible with other codes in the AGORA comparison test suites of cosmological runs.
(FYI, the only other place where RadiationRedshift* parameters are used is in Enzo is RadiationFieldCalculateRates.C. This file is not used anyway if RadiationFieldType = 0 -- which is often the case when Grackle is employed for cooling/radiation calculations.)