Updated CosmologySimulationInitialize.C and Grid_CosmologySimulationInitializeGrid.C so that they allocate sufficient fields for passing photo-ionization and photo-heating rates from FLD solvers into Enzo's chemistry and cooling routines. The changes have been well-enclosed within #ifdef and other "if" statements as to only affect cosmological FLD simulations.
Ah, right. I wasn't thinking very clearly. At this point we don't actually test the cosmology simulation. We need to revisit that soon, but it's not a blocker for this PR. I think once we get comments from the two others above, this is good to go. Thanks @drreynolds !