With the stock 3.9, selecting a configuration I've saved gives me, "my
subclass should have implemented #loadVersion".  Loading
MonticelloConfigurations-jl.43 from source.impara.de/mc got me past
that, but breaks trying to ask a MCVersionLoader loadWithNameLike:,
which is only implemented by MCMerger and MCPackageLoader.

I have the Monticello that coomes with 3.9-7067, looks like
Monticello-md.308.

I'm trying once again to migrate to 3.9 and configurations, any help is
appreciated.

 - Chris