[v2.3] Binary population test suite and reorganizing dev-tools

[sgossage]

This is a cherry picked version of PR#779 for v2.3.

This adds a population synthesis test suite and performs 4 tests currently:

• BinaryPopulation saving binaries to RAM.
• BinaryPopulation saving to hdf5, plus check saved/loaded DataFrame is equivalent to binaries in RAM.
• BinaryPopulation saving in multiple batch hdf5 files (i.e., w/ optimize_ram = True).
• PopulationRunner with multiple metallicities¹. TODO: add a flag to turn on/OFF
• Test full pop synth pipeline via CLI. This would need to be performed on HPC, so maybe a separate script.
• Compare between branches automatically. E.g., using saved .h5 files from base branch.

Warning

We should check this vs. PR#780. Both PRs substantially restructure things in the dev-tools directory. Likely, we merge PR#780 first, then integrate it into this PR.

This also reorganizes dev-tools as follows:

dev-tools/
├── run_test_suite.sh
└── script_data/
    ├── inlists/
    ├── output/
    │   ├── binary_star_tests/
    │   └── population_tests/
    └── src/
        ├── binaries_suite.py
        ├── binary_test_cases.py
        ├── formatting.py
        ├── popsynth_suite.py
        └── utils.py

where the .ini files are generated on-the-fly in inlists/ and test output is saved to the various output/ subdirectories.

Footnotes

1. ⚠️ The PopulationRunner test is implemented but disabled at the moment because it can break without appropriate system resources. This should be enabled prior to accepting this PR. (RAM fix helps here: PR#818). ↩