Implement minimum energy check in cooling, fexed bug with crashing on some particles due to slightly negative entropy

Better naming convention for the comoving and physical time-derivatives of the thermodynamic quantities in the Gadget2 scheme.

Use the correct inline keyword in the non-EAGLE flavours of cooling to allow compilation of the code.

Revert "Apply the correct du/dt to the particle in the cooling. It must be the hydro one + the cooling one."

This reverts commit eacfa8a1.

Include the integer min and max limits in partition.c and activate their usage in C++ via macro definition.

Merged gravity M-M tasks

See merge request !606

Moved the check of negative flags for hydro pairs to the debug code. That never happens in real life code.

Moved the check of negative flags for hydro pairs to the debug code. That never happens in real life code.

Cosmology pressure energy

See merge request !611

Fixed more compiler warnings with GIZMO in runner

See merge request !614