21.10

A new option, castro.drive_initial_convection was added that
uses the temperature interpolated from the initial model instead
of the value on the grid to call the reactions. This helps
prevent a reactive zone from burning in place before a convective
velocity field is established to carry off the energy.
The burn_weights are no longer stored by default in the plotfile.
Instead, they are now enabled by setting
castro.store_burn_weights=1. Additionally, they now give a better
estimate of the cost for the numerical Jacobian (#1946, #1949)
castro.change_max is now required to be greater than 1.0. To enforce
a timestep cap but still allow the timestep to decrease, use
castro.max_dt. (#1976)
Gravity was modified to introduce parallel plane gravity with a
point mass by setting the radius of the star by
castro.point_mass_location_offset and the integer
castro.point_mass_offset_is_true == 1. By default, both
parameters are 0.0 and 0, respectively.

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