Address various deprecation warnings. #40
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As of OCaml 4.02:
To the latter point, the changes to Pretty and Errormsg are only necessary for compilation in 4.06; behavior should be the same in previous versions.
As of OCaml 4.03:
I have confirmed compilation in 4.03, 4.04, and 4.06.0+trunk (with other changes to fix the Num module movement problem, a different PR) on Darwin. I have run "make test", and the same tests fail before and after the changes (which really should be semantics-preserving).