[PATCH] Add support for --output-delimiter=STR to comm

[Bo Borgerson]

Hi,

I submitted a version of this on Friday.

This updated version includes the following changes:

* Separate fputs in usage to stay away from ~500 char limit.
* More appropriate commit message.
* No --null-output-delimiter option.  Just the --output-delimiter=STR,
as specified in the TODO item.

Thanks,

Bo

comm-delimiter-2.diff
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