Support to give specific subdirectory path and files when running command

[stalker314314]

Say, user wants to process just some subdirectory, it would be good if we can support

./occ face:background_job --path /files/username/pics/just_one_vacation

It will affect some tasks (where applicable), but some will be indeferent to this.

Of course this must accept files as parameters, to allow analysis of point images, which allows testing. Issue #245

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