-------------------------------------------
var,funct (left-click): read mgz (or COR dir)
  set inoutim <CORdir *or* mgz>
  write_images
-------------------------------------------

The "W" button writes out the current state of
the editable image buffer to either a COR dir or
an .mgz/.mgh file.

Currently, this won't convert between the COR dir
and .mgz/.mgh formats.  That is, if COR dir was
read in, only a COR dir can be written and vice
versa.
