Warning on tabs by default (#9230) for GHC 7.10

[Stephen Paul Weber]

>Making tabs warn by default has been requested many times before, and
>now that the compiler is completely detabbed, this should become
>possible to enable easily, and we can gradually remove warnings from
>everything else.

I hate this, but I assume there will be an easy flag to turn this warning 
off that I can put in all of my builds.

-- 
Stephen Paul Weber, @singpolyma
See <http://singpolyma.net> for how I prefer to be contacted
edition right joseph
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