ChemicalEvolutionInterface

[elkogerville]

With the addition of chemical evolution codes like Krome and Uclchem, an interface to unify them is needed.
The ChemicalEvolutionInterface interface should live in src/amuse/community/interface along with the other interfaces like GravitationalDynamicsInterface, etc..

• Create chem.py in src/amuse/community/interface
• Identify the common setters and getters between Krome and Uclchem
  • Core AMUSE methods (evolve model, commit_particles)
  • Chem specific methods (set_abundances, get_firstlast_species_index)
• Create the ChemicalEvolutionInterface Class
  • Add setters and getters as legacy / remote functions
• Create the ChemicalEvolution class
  • Add the methods defined in the ChemicalEvolutionInterface as either methods, properties, or parameters
  • Define particle sets
  • Define state model
• Create a set of Mixins to differentiate between chemistry codes that use temperature + number density and codes that use internal energy + density, mimic the naming convention found in gd.py
  • Create ChemDensityInternalEnergyInterface and ChemDensityInternalEnergy
  • Create ChemNumberDensityTemperatureInterface and ChemNumberDensityTemperature
• Vectorize retrieving and setting abundances due to large overhead when doing this sequentially
• Refactor Krome to use these interfaces
• Refactor Uclchem to use these interfaces