cal is now fully typed

Big holiday here, so I got the day off from Sun. Had a root canal done (oh joy!). But at least the price was right--US$30.

In reworking gencal, just about everything gets a DescriptorUnit--29 DescriptorUnits in all. Right now there isn't a lot of benifit to doing that. Yes, I'm playing a bit here. But as the capabilities goverened by DescriptorUnits grows, this becomes much more worth while. But yes, there's still quite a ways to go yet.