Restore: side-operations to use unpigz when available

Version 1.60.0

Feature
Finished

If the pigz=# option is set in the directamdin.conf with the unpigz binary present, previously, only the main extraction of the full tar.gz was using unpigz. Now, other areas will use it as well: - extraction of full file listing to determine what we have to work with prior to extracting other files - extraction of backup/backup_options.list - extraction of backup/user.conf will now use the unpigz when set. It was found the extraction time is more than 2x the speed with the same hardware vs just tar (using pigz=8 in my case on a VMware box with very high raid read/write speed)

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