[Processing] MAJOR FLAW IN DESIGN when processing pools fro mdifferent sites

[ridz1208]

FOR SOME REASON @HenriRabalais has commented out the code that prevents pools from different sites or even specimens from different sites to be processed simultaneously.

This has to be undone IMMEDIATELY to resolve an issue where when pools from different sites gets processed in the same operation, one or the other inherit the wrong site in the preparation info