Added support in domain for an interpolation to a larger region later to be subset
Added support in domain for an interpolation to a larger region later to be subset

In particular, winds can have a larger geo grid on each image so that it will interpolate a wind field
outside of the current image.  This way additional winds are present for the smoothing algorithm, and there
will be no border between images (once we provide a larger geo grid to each image)

NCAR/icar,gutmann/icar,gutmann/icar,gutmann/icar,NCAR/icar,NCAR/icar