v0.12.0

• The parallel keyword argument is renamed to n_threads throughout, allowing an exact number of threads to be specified with the default remaining Threads.nthreads().
• Arguments for bonded interactions are made more consistent: HarmonicBond has kb renamed to k and b0 to r0, HarmonicAngle has cth renamed to k and th0 to θ0, and MorseBond has α renamed to a.
• An additional type parameter is added to System that records whether it is on the GPU. The is_on_gpu function is added to access this property.
• The Interaction abstract type is removed.
• The HarmonicPositionRestraint interaction for restraining atomic positions, commonly used during equilibration of biomolecular systems, is added. InteractionList1Atoms and SpecificForce1Atoms are added to allow the definition of interactions that apply a force to one atom. The add_position_restraints function is added to apply position restraints to a System, along with the atom selector functions is_any_atom and is_heavy_atom.
• The CosineAngle interaction for the cosine bond angle between three atoms is added.
• The FENEBond interaction for the finitely extensible non-linear elastic (FENE) bond between two atoms is added.
• The masses function to access the mass of each atom in a System is added.
• AndersenThermostat is made differentiable.
• DistanceNeighborFinder and TreeNeighborFinder now use FLoops.jl and show improved performance on multiple threads.
• Inconsistent System setup now throws an error.
• Equations are added to some docstrings.