[GHC] #9690: in GHCi map `:editNNN` to $EDITOR +NNN

[GHC]

#9690: in GHCi map `:editNNN` to $EDITOR +NNN
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       Reporter:  heisenbug          |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  GHCi               |                 Version:  7.8.3
       Keywords:                     |        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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 I suggest to treat GHCi REPL commands `:editNNN` (as well as equivalent
 abbreviations, like `:eNNN` ) where `NNN` is a natural number, as
 invocations of the text editor with a `+NNN` option.

 Rationale: When I see a type error in line 42 then I'd like to visit this
 line directly with `:e42`. Optionally one could implement `:eNNN:CCC` to
 also target the column `CCC` in that line.

 `emacs`, `vi` and `pico` all implement the option `+NNN` to land in the
 line `NNN`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9690>
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