optional quantum correction terms for chabrier1998

[zhichen3]

added a runtime parameter to make quantum correction terms in chabrier1998 screening optional. This is because in NSE_solver quantum terms are not included.

Also fixed some inconsistent indentations

This should also speed up this screening a little bit (issue #1396), although we already switched integer pows to powi.

pr #1426 should be reviewed before this.

[zingale]

chug09 fails to compile:
http://groot.astro.sunysb.edu/Microphysics/test-suite/gfortran/2023-12-31-003/test_screening_chug09.html

[zingale]

do we expect such large diffs from this PR?
http://groot.astro.sunysb.edu/Microphysics/test-suite/gfortran/2023-12-31-003/test_screening_chabrier1998.html

[zhichen3]

chug09 fails to compile: http://groot.astro.sunysb.edu/Microphysics/test-suite/gfortran/2023-12-31-003/test_screening_chug09.html

oh there is a bug in the script I wrote that it wouldn't pick up the correct integer power if there are multiple commas (such as pow inside a pow). That was the case for gcem::pow in chugunov2009, and you ran the test suite before I added that so it didn't pick it up.

[zhichen3]

do we expect such large diffs from this PR? http://groot.astro.sunysb.edu/Microphysics/test-suite/gfortran/2023-12-31-003/test_screening_chabrier1998.html

Is it possible to run it with screening.enable_chabrier1998_quantum_corr=1? Results should be identical if things are correct.

[zingale]

yep, I'll do that in the suite

[zingale]

tests pass now:
http://groot.astro.sunysb.edu/Microphysics/test-suite/gfortran/2024-01-01-002/index.html