put the schema under change management

[markdav-is]

I just looked at the data and there are a bunch of extra fields. It's making the API confusing. The schedules is a good example. they are double-linked. I also see duplicate address and duplicate lat-long. It looks like folks are creating extra fields to work thru some issues data issues and then just leaving them hanging around. The schema should be more controlled and change under a change-management process.