[Dev] ContentModel, Calendar, Contacts, etc. reorganization/flattening

[Jeffrey Harris]

Hi Phillip,

> Note that what I was proposing is to rename calendar/Calendar.py to just
> calendar.py, and the same for recurrence.  I was under the impression,
> however, that recurrence was supposed to be able to be used for tasks as
> well at some point, so maybe I'm confused...?

This has changed back and forth in my mind, so your confusion is
indubitably attributable to me :)

Tasks may recur, but in discussions with lots of folks, we decided that
a Task, or anything else that wants to recur, can reasonably do so by
just being stamped as an event.

Sincerely,
Jeffrey