This is a simple list of the improvements we wish to make to pyro.

ArrayIndexer:

-- rewrite the ArrayIndexer class to simply subclass ndarray. This is

already speced out in mesh/experiments/test_subclass.py

new solvers:

-- Burgers equation (viscous and inviscid)

-- low Mach number hydro (both combustion and atmospheric)

-- nodal MG solver?

-- radiation hydro (gray FLD)

infrastructure:

-- the MG solvers should check that the incoming coefficient arrays

have the same # of ghost cells -- perhaps the coefficients should

come in as their own ccdata2d object? or pass in a grid object

like we do got mg.get_solution()