[lsst-dm-stack-users] Changes to make sub-images less clunky

[Robert Lupton the Good]

FYI, after the SLAC demo I felt really embarrassed by
	subIm = im.Factory(afwGeom.BoxI(afwGeom.PointI(10, 20), afwGeom.PointI(20, 30)))
to get a subimage.  I realised that this wasn't necessary, and the latest afw supports
	subIm = im[10:20, 20:30]
or
	im[12:15, :] = -1

A side effect is that
	im[10, 20] = 10
and
	print float(im[20, 30])
also work.

							R

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