Fixed incorrect cosmology factors for pressure and internal energy in the i/o

See merge request !895

Gear merge pressure floor and GEAR star formation

See merge request !885

Removed large stack-overflowing VLAs from the code.

See merge request !882

Adds v_sig calculation to force loop in ANARCHY-DU

See merge request !892

When doing a dry run that generates particles from the ICs, do not verify the (non-existing) particle links after creation of the gas particles.

Update i/o API in all examples (within reason)

See merge request !893

Backported the new interface to the chemistry from the COLIBRE fork.

See merge request !891

Remove drho_dh

See merge request !890

Update testRandom

See merge request !888

Update testRandomSpacing

See merge request !886