Eligibility of panels and regererence yearset combinations does not reflect version

Combinations of panels and reference year sets for which local densities can be calculated, does not seem to take the version of local denisty into account.

Often, panels and reference yearsets of the last inventory cycle are offered for calculation, even in case of target variables in version 200 (after corrections based on data of the next inventory, but there is no next inventory data for last inventory).

@kohnivo