Layered

[fweik]

Description of changes:

• Removed layered topology

This only needed to exist for MMM2D, which was since removed. The same
functionality can be achieved by the regular domain composition using the
fully_connected flags.

[codecov]

Codecov Report

Merging #3512 into python will increase coverage by <1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           python   #3512    +/-   ##
=======================================
+ Coverage      86%     87%   +<1%     
=======================================
  Files         537     536     -1     
  Lines       24542   24177   -365     
=======================================
- Hits        21351   21058   -293     
+ Misses       3191    3119    -72

Impacted Files	Coverage Δ
src/core/global.cpp	83% <ø> (+7%)	⬆️
src/core/electrostatics_magnetostatics/coulomb.cpp	80% <ø> (ø)	⬆️
src/core/cells.cpp	88% <ø> (-2%)	⬇️
src/core/cells.hpp	100% <ø> (ø)	⬆️
src/core/short_range_loop.hpp	100% <ø> (ø)	⬆️
src/core/actor/Actor.hpp	60% <0%> (ø)	⬆️
src/core/actor/DipolarDirectSum.hpp	88% <0%> (ø)	⬆️
src/core/actor/DipolarBarnesHut.hpp	80% <0%> (ø)	⬆️
src/core/metadynamics.cpp	7% <0%> (-4%)	⬇️
src/core/particle_data.cpp	95% <0%> (-2%)	⬇️
... and 31 more

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[jngrad]

LGTM, pending CI