Added co-moving Sod shock test.

See merge request !694

Make the parallel-io code also create the Temperature field in the snapshots before trying to write to it.

Correct calculation of the next snapshot output time even in the cases where the next snapshot is the end time or too close to it because of floating-point rounding errors.

Make the parallel-io code also create the Temperature field in the snapshots before trying to write to it.

Cancel the call to the Newton scheme in a different way in the EAGLE cooling. This will make the Intel compiler more happy.

Update velociraptor doc

See merge request !696

Add functions to calculate temperature of particles.

See merge request !697

Made sure co-moving Sod shock is run for the same amount as (re-scaled) time as the non-co-moving version.

Update the small cosmo volume YAML files with the correct parameter names for the EAGLE cooling model.

Clarified expression for delta_z in the cooling routine. Added function stubs for temperature calculation.

Added derivation of comoving Euler equations to cosmology theory document.

See merge request !590