Comoving energy sph

See merge request !597

Use a gravity glass file to generate the ICs of the constant cosmological volume

See merge request !602

fix memory error in testSelectOutput

See merge request !600

Tag only supercells

See merge request !595

Use git to enumerate the .c and .h files that are under control, otherwise we fail when temporary .h files are also formatted (version_string.h)

Also tag all top-level cells with foreign partners, do the multipole exchange after maketasks so that we have all the necessary tags available

Add some additional checks as well

Add testFormat

See merge request !599

Handle pipe errors more explicitly, failing at first command in the pipe was OK for automation, but not very informative when ran interactively

It is SWIFT not Swift

Add a glass making master option

See merge request !598

Conflicts:
	src/engine.c

Conflicts:
  src/cell.c
  src/engine.c

Use MPI communicators to reduce the use of tags.

See merge request !591

Put the checks for i/o dumps into a separate function. Call that function after the 0th step as well.

Planetary gravity fixes

Closes #451

See merge request !596

Only record that a top-level multipole has interacted via long range if it actually found any neighbour within range.