[GHC] #13444: Disable diagnostic coloring by default

[GHC]

#13444: Disable diagnostic coloring by default
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        Reporter:  hvr               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 I'd prefer to make the default `auto`. To be frank, looking pretty in your
 coloring scheme seems less important than helping new users understand
 what's going on.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13444#comment:3>
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