Make unused/redundant gridfunction storage optional in HydroBase
Issue #1929
new
The w_lorentz & eps gridfunctions are always stored in HydroBase, despite the first being redundant and the second unused (in IllinoisGRMHD, at least).
Storage for these should be optional; I would suggest enabling storage of these gridfunctions by default (current behavior, won't break anything) but allowing the storage to be disabled.
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