iset module to the interval module. Many of the names within the module
have also changed, and I've refactored a lot of the code. The updated
version can be found at http://members.cox.net/apoco/interval/, as well
as a change log.
Again, any suggestions would be greatly appreciated. I especially want
to sort out big design-level changes first. Then I can upgrade the
project status to beta and try to keep interface compatibility intact.