AMReX-Astro/Castro: Castro 19.10

-- The SDC algorithm now implements the burning conditionals depending on rho and T (react_rho_min, react_rho_max, react_T_min, react_T_max) (#598, #654) -- The SDC/MOL PLM reconstruction now implements reflecting BCs on the interface states (#652, #654) -- A well-balanced scheme has been added to the piecewise linear SDC method, enabled with castro.plm_well_balanaced=1. At the moment it only supports constant gravity. (#294, $654)) -- The weighting of the time-node fluxes stored in the flux registers for SDC has been fixed (#654, #658) -- As before, we can choose the reconstruction with PLM using the castro.plm_iorder flag: 1 = piecewise constant, 2 = piecewise linear slopes. Now we added a way to specify the limiter used with the linear slopes. castro.plm_limiter = 1 will use the 2nd order MC limiter and castro.plm_limiter = 2 will use the default 4th order MC limiter (previously there was no way to select the 2nd order limiter). (#654) -- The Runge-Kutta based method-of-lines integration method has been removed in favor of the SDC integration. (#657) -- A new way of specifying the problem runtime parameters has been introduced. They can now be specified in a plain text file, _prob_params, and at compile time, the probdata_module is automatically created. This automates the creation of the probdata variables, the namelist for reading them, setting them as managed for CUDA, and adds the ability to output the values to a file (like job_info). This feature is opt-in. You need to set USE_PROB_PARAMS in your GNUmakefile and then define the problem parameters in a file _prob_params in the problem directory. (#234, #619, #673) -- The time to output is now stored in the job_info file (#365) -- The SDC time advancement method has been documented -- The job_info file now reports the number of GPUs being used