[daip] image MAX/MIN after IMAGR

[Claire Chandler]

It seems that the image MAX/MIN in the header of a spectral line cube
created by IMAGR corresponds to the max and min of the dirty images rather
than the CLEANED images.  At least, IMSTAT gives max/min values very
different from those in the image header, and it is confusing to then use
KNTR or some such routine which labels the plots with the wrong peak flux.  
Or maybe I'm just easily confused.

Claire