added equation that sums pressure, gravity, and rotation together to get the displacement force. Note that some of the dependencies of this have not been commited yet as they lack documentation
These help constrain what are valid equations at compile time thereby preventing invalid equations from causing runtime crashes due to missing methods and members (this does not validate anythinng about the physics of an equation, only that the form of the equation is right). Note that this is done at compile time rather than with runtime polymorphism to avoid both indirection cost but more imporantly to allow the compiler to more easily inline functions and preform other optimizations that indirection can hide.
This equation provides a constraint on central density through specific enthalpy (I think this is general so long as the eos can convert, though I wrote this for the barotropic case). This may need to be changed latter to be more general (though also generally we should not constrain central density). this is really there to deal with the specific non-rotating n=3 case where the central density is ill-defined due to a singularity.
Broadly MeanField had a system that would map the full index of degrees of freedom to some reduced index space based on domain support. This system has been cleaned up and ported. Further, we have consolidated this system into the discretization system from where it lived in MeanField (in the operators subsystem)
most (though not all) of the runtime eos code is now present in the new version. What remains is the templated try_evaluate method along with both the templated and non tempalted try_partial_derivative methods.
The full rewrite of mean_field into something maintainable is progressing. dimensions is mostly done, discritization (domain, blocks, and fields) is done, and eos is progressing quickly
