YASS integrator#1985
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- Implement YASS (Yet Another Simple Solver) from Khokhlov et al. 2012 as a variant of the BackwardEuler integrator: single Newton iteration with Y^0 as initial guess and step size control based on relative change per step (|Y^n - Y^0| < eps * Y^0 for species above floor) - Add runtime parameters: use_yass, yass_eps, yass_floor - Restore VODE_MAXORD from 1 to 5 in vode_type.H - Fix actual_rhs signature in primordial_chem to take const burn_t&
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Prototype YASS integrator.
Also some fixes for primordial_chem w/ use_number_densities + BackwardEuler.