lbase: Base level of regridding; finer levels are being
regridded, but lbase is not.
level: Level on which space is being reclaimed.
nvar: Number of independent variables.
naux: Number of dependent variables.
Description:
Reclaims flux storage space in the main storage
array for grids at level level. If level=lbase, only
the space at cfluxptr is reclaimed from each grid. If
level>lbase, then the space at ffluxptr is reclaimed as well.