global: do not offer the renice option, let's the user handle that

It's broken anyway. Eg.:
- user is already niced at 10
- user configures to renice at 5
- breaks because user is not allowed to 'boost' his/her nice value

Bette let the user handle the renice with:
nice -XX ct-ng 'action'

reporter_name="Dragan Marinkovic <marinkovic.dragan@gmail.com>"

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