We need to switch to getopt_long() when it's available. We're running out of letters which are in the words that best describe the arguments we want to be able to pass in to getcert's various commands.
getopt_long() isn't universally available, and I don't really want to drag a copy of gnulib's implementation around, so popt it is.
Metadata Update from @nalin:
- Issue set to the milestone: 0.78
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