Use the right groups for tracking/serial/packaging

It seems that in stock/*.xml, the groups for options regarding serial/lot, logistic units and parcel tracking are all mixed up.
This should sort it out.
I doubt it would fit. product.group_stock_packaging is concerned with making the logistic unit size consistent (i.e. 1 pallet = 1200 pieces). Then users who want to enter parcel tracking would have to activate this other feature in the settings, it's quite counter-intuitive.