mknos / PerlPowerTools / 33880316468

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cut: use error exit-code if a file argument does not open (#1054)

* cut: use error exit-code if a file argument does not open

* When testing cut today I discovered that it uses the idiomatic while(<>) loop for reading input in handle_b() and handle_f()
* If file arguments are provided, all should process correctly in order for a success exit-code
* Hijack the WARN signal to set exit code; in future handle_b() and handle_f() could be restructured if necessary
* If a directory is passed as an argument it is ignored; this is consistent with OpenIndiana & OpenBSD, but GNU cut raises a warning for it

* existing warn() messages no longer need $me

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