make 2000 default epoch

[kurisutsukato]

The default epoch of the FS is 1950. It would be nice to have it updated to 2000.

[wehimwich]

This is a good idea.

One complication is that drudg is imported from another package, sked. The maintainer (@gipson55) of that package would probably need to make the change. I will pass that up to him (he should see this comment). We would also want a simple script to change skedf.ctl to enable epoch 1950 as the default for anyone who depends on the old epoch and hasn't done that already. We do that kind of thing all time for the installation of new versions, so it should be easy.

Another issue is whether we would need a control file option, maybe in equip.ctl, to select what the default epoch is for the source=... command. I would have to think about that.