Hi,

Following Efraim's suggestion I arranged a new patch around the tuning 
option. I needed to patch Zig itself to use baseline cpu by default, 
which is safer in general for us.

If anyone need a more specific cpu, can use the tuning option to choose it.

Maybe I should split the changes in Zig and the tuning system, but if I 
do they wont appear together, and they mostly only make sense if applied 
at once.

Please let me know if you like this one better.

Hope it's cool.

Cheers,
Ekaitz