make edlin understand a few important control keys

Hi Fredrik,

> I've gotten some feedback from your review,
> You need to add documentation under Erts-> "User's Guide" -> "tty - A
> command line interface"
>
> You need to add testcase in interactive_shell_SUITE a simplified
> example of how this testcase could look like;
> ctrl_w_and_ctrl_u(_Conf) ->
>     rtnode([{putline,""}, {putline, "2."}, {getline, "2"},
> {putline,"xxx yy"++[$\^w]++"."}, {getline,"xxx"}, {putline,"xxx
> yy"++[$\^u]++"z."}, {getline,"z"}],[]).

Please find an updated version of the patch attached to this e-mail. I
hope that you still accept it via e-mail because the former patch was
sent the same way ;-).

I have extended the documentation to list the new key combinations and
added tests to make sure they work.

Kind regards,

--
Dr. Stefan Zegenhagen

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>From ce4b827c78d18f39bb1146fd2959ffd7ae2b4bb6 Mon Sep 17 00:00:00 2001
From: Stefan Zegenhagen <[email protected]>
Date: Mon, 6 May 2013 14:39:07 +0200
Subject: [PATCH] [EDLIN] support a few more control keys

Add support for the following control keys that many users have become
accustomed to:
 - <CTRL>+W         : backward kill word
 - <CTRL>+U         : backward kill line
 - <HOME>           : goto start of line
 - <END>            : goto end of line
 - <CTRL>+<LEFT>    : backward word
 - <CTRL>+<RIGHT>   : forward word

It seems that the <CTRL>+<LEFT|RIGHT> control key sequences are
different between terminal emulators, therefore a few possible
combinations were added (similar to how libreadline is configured).

Documentation and tests are extended to reflect the new functionality.

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