cvtenc from stdin

[Björn Gohla]

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i made the following change to core/base/Tools/cvtenc in the hope of 
enabling it to process input from stdin if no filename is provided. all i get 
is an uncought NSRangeException, i do not know where it comes from, my 
debugging env is boken. perhaps someone can tell if i am trying to do 
something totally wrong here.

- -- 
Article 28 from the Universal Declaration of Human Rights
   Everyone is entitled to a social and international order in which the
   rights and freedoms set forth in this Declaration can be fully realized.
pub  1024D/834F4976 2001-01-07 Björn Gohla (Wissenschaftler, Weltbürger) 
<b.gohla@gmx.de>
     Key fingerprint = 9FF4 FEDA CCDF DA0E 14D5  8129 6C14 3C39 834F 4976
sub  1024g/29571FE2 2001-01-07
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cvtenc.diff
Description: Text document