[racket] Suggestion: Allow above, beside etc. to accept a single image.

Currently *above* from 2htdp/image requires at least two arguments. I.e.

procedure

(above<file:///Applications/Racket%20v5.3.6/doc/teachpack/2htdpimage.html?q=define#%28def._%28%28lib._2htdp%2Fimage..rkt%29._above%29%29>
 i1 i2 is ...) →
image?<file:///Applications/Racket%20v5.3.6/doc/teachpack/2htdpimage.html?q=define#%28def._%28%28lib._2htdp%2Fimage..rkt%29._image~3f%29%29>


Recently I have been using an idiom where I stack a list of one or more
images.
I.e.

(apply above list-of-images)

I have a workaround, but it seems to me that a more tolerant "above" --
which acts as an identity when passed a single image -- would be an
improvement to the
library.

Similarly for beside, etc.


Dan
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