[plt-dev] super class in error messages

Anyone mind if I apply this patch? It prints the super class value in 
error messages. Two things that might need to be changed first:
1. other errors print super using ~e, whereas I use ~a. Is that important?
2. usually the error message is some text followed by values, as in 
"super class blah blah: ~a~a~a" but I put the super value right after 
the words 'superclass': "superclass ~a blah blah blah: ~a~a".
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