Two patches

[Austin Seipp]

Hi,

Attached are two patches that update the users guide with respect to
unboxed tuples, and another one that fixes DriverPipeline so that it
does not pass -Wimplicit to the C++ compiler (this gives an ugly
warning in gcc 4.6+ because it's C/ObjC only, and I have a cabal
package that builds a lot of C++ source files and it's very
displeasing to see.)

If both of these could be merged to head and 7.6 that would be great.
The release notes should also be updated to reflect the unboxed tuples
changes. This part of the users guide should probably be given a once
over to make sure it's still accurate (there may be things I missed.)

-- 
Regards,
Austin
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