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Rename () to Unit, (,,,...,,,) to Tuple<n>

Andrei Borzenkov requested to merge sand-witch/ghc:wip/int-index/tuple-tycon-puns into master

This is an MR of implementing one part of Non-punning list and tuple syntax proposal.

It renames unit and all tuples:

- data () = ()
- data (a,b) = (a,b)
- data (a,b,c) = (a,b,c)
- data (a,b,c,d) = (a,b,c,d)
- data (a,b,c,d,e) = (a,b,c,d,e)
...
+ data Unit = ()
+ data Tuple2 a b = (a,b)
+ data Tuple3 a b c = (a,b,c)
+ data Tuple4 a b c d = (a,b,c,d)
+ data Tuple5 a b c d e = (a,b,c,d,e)
...

And fixes printing everywhere, so user will see plain old tuples in error messages.

Edited by Andrei Borzenkov

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