Track plot ids for the female and known males in a population for an OP cross

[keocorak]

Expected Behavior

Some cross types allow the front-end user to track the exact parents used in the cross by selecting the appropriate male and female plots in a trial (ex: biparental, backcross). Others do not, usually when a population is designated as the female(s) and/or male(s) parent (ex: open pollinated, bulk). I'd like the ability to track specific parents, if known, for these types of crosses too.

I can see a couple ways that this could be implemented, but discussion is probably warranted.