[schooltool] calendar management proposal

[Tom Hoffman]

I've posted a proposal for rearranging how we manage calendar
"overlays" in the SchoolTool UI.

The body text is here:

http://www.schooltool.org/Members/th1a/fixing-calendar-managment

And it is registered on Launchpad here:

https://blueprints.launchpad.net/schooltool/+spec/calendar-managment

--Tom