How to best display type variables with the same name

[Christopher Done]

We've encountered a problem in Intero which is that when inspecting types
of expressions and patterns, sometimes it happens that the type, when
pretty printing, yields variables of the same name but which have different
provenance.

Here's a summary of the issue:

https://github.com/commercialhaskell/intero/issues/280#issuecomment-
254784904

And a strawman proposal of how it could be solved:

https://github.com/commercialhaskell/intero/issues/280#issuecomment-
254787927

What do you think?

Also, if I were to implement the strawman proposal, is it possible to
recover from a `tyvar :: Type` its original quantification/its "forall"?
I've had a look through the API briefly and it looks like a _maybe_.

Ciao!
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