minor 'cat' enhancement w/ patch

[Tom Warzeka]

Hello!  I sometimes use 'cat -E' as a quick check for lines with trailing 
white space.  I understand that '$' was chosen as the end-of-line character 
due to its usage in regular expressions.  However, I like to use a more 
conspicuous character, such as '@'.  So, I thought, how about letting the 
user specify the end-of-line character?  While doable with 'sed', it was 
quite easy to add an option to accomplish this.  My proposed new syntax is:

cat -E -c @ ...

or

cat --show-ends --end-char=@ ...

It is minimally intrusive and does not affect backward compatibility:  when 
one of the new options is not specified, the end-of-line character is still 
'$'.  Alternatively, use of one of these options could automatically turn-on 
displaying an end-of-line character
(just add "show_ends = true;" within the new case).

Here's my patch submitted for your perusal.  It is applied to 
coreutils-8.20, the current latest stable release.  If you decide to include 
it, feel free to make any changes you see fit.  Thanks!

-- Tom

cat-coreutils-8.20.patch
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