Clean the physics parameters (add gyrokinetic equation namelist). #218

Job	Run time
Build stella quickly	1m 39s
build-stella (macos-13, Make)	9m 47s
Automated Fortran tests	6m 9s
Build stella in debug mode	59s
build-stella (macos-13, CMake)	7m 15s
build-stella (macos-14, Make)	5m 49s
build-stella (macos-14, CMake)	3m 54s
build-stella (ubuntu-20.04, Make)	5m 33s
build-stella (ubuntu-20.04, CMake)	5m 34s
build-stella (ubuntu-22.04, Make)	3m 34s
build-stella (ubuntu-22.04, CMake)	3m 16s
build-stella (ubuntu-24.04, Make)	4m 0s
build-stella (ubuntu-24.04, CMake)	9m 6s
Python tests on 1 processor	2m 8s
python-tests (1 - Does stella run )	47s
python-tests (2 - Geometry)	44s
python-tests (3 - Gyrokinetic equation)	55s
python-tests (4 - Flux tube)	53s
python-tests (5 - Diagnostics)	1m 38s
python-tests (6 - Full Flux Surface)	58s
python-tests (7 - Electromagnetic effects)	1m 6s
	1h 15m 44s

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