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

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

Eagle cooling

See merge request !593

Declared all the cooling tables sizes as compile-time constants. Renamed many variables. Clarified CGS nature of many variables.