Correct additional eagle cooling abundances

Closes #509

See merge request !708

Get the constants Msun/pc^2 and Msun/kpc^2/yr from the constants instead of making a constant for them

If h is h_max then set rho_dh to 0, prevent insanely high grad_h_term

See merge request !706

'Making extra starsloop tasks' should be labelled as a rebuild operation in the runtime analysis script.

Non periodic BCs: Correct particle treatment

Closes #342

See merge request !703

Replace all variables that are printed to user specified units instead of converted to internal units

Added a function to the hydro scheme to be called when a particle gets removed due to non-periodic BC infringment.