open-zfile: Make compress & uncompress commands optional
If compress is not found, we disable writing to .Z files,
but leave the rest of the compression code active.
If uncompress is not found, we use gzip to read .Z files.
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If compress is not found, we disable writing to .Z files,
but leave the rest of the compression code active.
If uncompress is not found, we use gzip to read .Z files.