Fix misleading items_per_thread tuning parameter for select

[bernhardmgruber]

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[gevtushenko]

I'd approach this differently. Instead of renaiming the macro, I'd remove the items scaling in the places where it's used. This would make the encoding easier and help search process have finar granularity on each parameter.

[bernhardmgruber]

I'd approach this differently. Instead of renaiming the macro, I'd remove the items scaling in the places where it's used. This would make the encoding easier and help search process have finar granularity on each parameter.

I wondered about this myself. Alright, let's change this when we are done merging all tunings.