two forms generated for neg.ifi.evid forms

[jonorthwash]

Currently all possible <neg><ifi><evid> forms have two possible generated forms. For example, кет<v><iv><neg><ifi><evid><p1><sg> outputs both кетпеппін and кеткен жоқ екенмін.

The forms кетпедім and кеткен жоқпын both analyse as кет<v><iv><neg><ifi><p1><sg>, but this analysis only generates the latter form.

We eventually need to find a (tag-based) way to distinguish between these forms. For the time being, we probably need to set one of the neg.ifi.evid forms to Dir/LR.

[jonorthwash]

Note that Kyrgyz presents a related issue.