Process options first.
Change command line processing to go through all of the options and associated parameters first, and then go through the command line again, processing the file names using the resolved options. In addition, if "-" follows a "--", then consider the "-" to be a file name instead of stdin. Both of these changes are to be more compatible with gzip, and are not compatible with the previous versions of pigz, which would process the options and file names in the sequence they appear.
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