Fix entry/selection of population families.

Populations can be grouped into families for presentation in the
menus. They can also be left ungrouped. These "families" are general
categories of data, whose only effect is to present the selection of
the populations from the menus in a more organised form.

The families can also differ from species to species, though there are
some very general categories that span multiple (all?) species.

This commit takes all the above into consideration, relaxing the entry
constraints and making entry of the families a lot more flexible.

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