[erlang-patches] Erlang shell patch for special keys

[Serge Aleynikov]

Attached patch fixes handling of special keys in the Erlang shell.  I 
tested this on Linux and Windows, though my primary concern was to get 
it working on Linux.

Del - Delete char at current position
^-> - Move right one word
^<- - Move left one word
^W  - kill a word
^U  - kill a line

Serge

P.S. ^U is a merge of someone else's contrib - I saw this on the mailing 
list a couple of years ago, but don't recall who the author was...
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