When compiling with the iosthermal equation of state, read the constant thermal energy from the YAML file.

Resolve "Check for drifted state in vectorized tasks"

Closes #380

See merge request !449

Doself subset vec

See merge request !445

List top-level cells with tasks

See merge request !441

Fix pair vec exit iteration

See merge request !447

Fix spelling

See merge request !448

Merge branch 'fix_pair_vec_exit_iteration' of gitlab.cosma.dur.ac.uk:swift/swiftsim into fix_pair_vec_exit_iteration

Bug fix: Fix the exit iteration padding.
 - Removes padding for the exit_iteration when looping over cj.
 - Calculates the padding correctly for the exit_iteration when looping over ci

See merge request !446

This reverts commit ab51e592.

 - Vectorised version of runner_dopair2_force

 - Expands testActivePair to include more test cases and to also test the force pair tasks 

 - Creates a branching function for DOPAIR2 so that the corner pairs are calculated using the serial version of DOPAIR2

 - pairs_all_force() now checks if particles are active before updating them

 - Added more macros to vector.h to improve code readability.


See merge request !440