[GHC] #9716: The list modules need a bit of post-BBP shaking

[GHC]

#9716: The list modules need a bit of post-BBP shaking
-------------------------------------+-------------------------------------
       Reporter:  dfeuer             |                   Owner:  ekmett
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Core Libraries     |                 Version:  7.8.3
       Keywords:  lists              |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 We currently have an unfortunately named `Data.List.OldList`, and no
 terribly clear story to explain it. One concept, due in part to me and in
 part to Carter:

 1. Move all the basics needed to implement `instance Foldable []` from
 `Data.OldList` to `Data.List.Base` (or some similar name).

 2. Move all the "extras" like `inits`, `tails`, and `sort` from
 `Data.OldList` into `Data.List`.

 3. Delete `Data.OldList`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9716>
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