Write the centre of each cell, its particle count and global offset to the snapshots. Works without MPI.

When interpolating the 1D tables in the EAGLE cooling model, use a small epsilon for the table edges to avoid out-of-table access.

Improve the check for cooling tables in the EAGLE model to prevent the constant re-loading of tables every step at z=0.

Correct additional eagle cooling abundances

Closes #509

See merge request !708

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

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