transcribe lookup_cool_rates0d 1/2

[mabruzzo]

This PR must be reviewed after #30

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This was the step 1 of 2 for transcribing lookup_cool_rates0d.

• the first 3 commits tweaked the fortran code. Prior to this PR some constant values were passed directly as arguments (in these cases, we used values of 0 or 1). Essentially, we introduced a few local variables to temporarily store these values and then passed the variables as arguments (this overcomes a limitation of the transcription tool)
• then we performed the initial transcription
• After doing the initial transcription, and reducing some most work was effort was devoted to refactoring all of the local variable so we could replace the calls to FORTRAN_NAME(cool1d_multi_g), FORTRAN_NAME(lookup_cool_rates1d_g), FORTRAN_NAME(rate_timestep_g) with the C++ wrappers (that use the reduced arg lists)
  • for example, historically the routine stored made a copy of every species mass density (and the internal energy) and stored the copies within local variables. Since all of our C++ wrappers expect this information to be specified within an instance of grackle_field_data, this needed to change:
    • several commits were storing the copies within the pointers specified by an instance of grackle_field_data (distinct from the instance passed to Grackle's API).
    • The local variables previously dedicated to holding the local copies were converted to references to the local copies. This let us avoid breaking the 1200+ lines of logic at the end of the function. Said logic was clearly copied from step_rate_g and then heavily modified. That logic is more directly addressed in the next PR
  • I also replaced >100 local variables with instances of the ColRecRxnRateCollection, PhotoRxnRateCollection, and GrainSpeciesCollection types since the C++ use these types to pass around large bundles of quantities (there was a bunch of search-and-replace done to avoid breaking logic at the end of the function)
  • I replaced a couple of local variables with an instance of IndexRange
• I also removed a bunch of unused local variables

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The that the cool1d_multi_g, lookup_cool_rates1d_g, and rate_timestep_g routines are only called from C++ source files AND the fact they are only called through the C++ wrappers (i.e. grackle::impl::fortran_wrapper::cool1d_multi_g, grackle::impl::fortran_wrapper::lookup_cool_rates1d_g, and grackle::impl::rate_timestep_g) is an important milestone. It means that they can be replaced with transcribed function.

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The resulting code in this PR is still very messy. But, I choose to make this PR at this point because it was a point when @ChristopherBignamini could working from this branch in order to transcribe cool1d_multi_g in parallel with my efforts. In fact, it was originally my intention to break this particular PR into smaller (slightly more logical) pieces, but I prioritized "getting done" in order to stop being a bottleneck for @ChristopherBignamini

Another PR has been posted to further cleanup lookup_cool_rates0d.

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I have confirmed that this PR passes all tests

[mabruzzo]

superseded by grackle-project#378