[daip] flatn for multiresolution imagr

[Eric Greisen]

robert becker writes:
 > hi, how do i combine multiresolution facets from imagr?
 > does flatn do it?
 > 

IMAGR leaves the extended resolution images as residuals and restores
the extended components to the point-source Clean image.  So the
facets for extended resolutions may be ignored post-IMAGR.  If you
also have multiple facets for the 3D business, then you combine them
with FLATN.

Eric Greisen