Convert the option parser to use getopt(3). This makes it more

orthogonal with the rest of the system (you can now use either -PPS or
-P PS), and makes the parser more intelligible.  The only drawback is
that the old semantics for the -i flag in case a non-numeric argument
is following are no longer fully supported (only if -i is the very
last arg at all), since getopt(3) doesn't support the discticnction
between numeric and non-numeric arguments.

Make lpr also understand dashes as input pseudo filenames.  This
finally makes lp(1) fully comply with Posix.2.

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