CO_331:0000680 and CO_331:0000809 confounding

[reyzaguirre]

In spbase 0000680 is Storage root total marketable yield weight computation tons per ha defined as Average commercial root weight evaluated in the harvest that must be in kg / root. Cannot be both.
In the ontology, 0000680 is Storage root marketable yield weight computation tons per ha, but as synonym it appears ACRW (Average Commercial Root Weight) that must be in kg / root.
In spbase 0000809 is Storage root total marketable yield weight computation tons per ha. As synonym it appears RYTHA, but must be CYTHA (C for commercial).
In the ontology 0000809 is something (no definition) in mg/kg.
For practical porpuses they are confounded in spbase, so it is not possible to distinguish what is ACRW and what is CYTHA (or maybe something else).

[bellerbrock]

related to #21 and fixed in 1bb83dd. Not sure why the fix isn't reflected in the database . . .

[bellerbrock]

looks like the old fix was accidentally overwritten. Reapplied it in a branch