diff: fixes to typeclass pretty-printing

[David Glen JEFFERY]

> Estimated hours taken: 0.5
> 
> compiler/mercury_to_mercury.m:
> 	Tidy up the output of typeclass and instance declarations.
> 	Previously there were a number of minor problems (instance
> 	declarations not implemented, unnecessary parentheses,
> 	newlines in wrong places).
> 
> tests/misc_test/Mmakefile:
> tests/misc_test/pretty_print.m:
> tests/misc_test/pretty_print.exp:
> 	Add a test case for pretty-printing.

That's fine. Thanks.


love and cuddles,
dgj
-- 
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