[Development] Calendar Systems proposal

[Edward Welbourne]

Allan Sandfeld Jensen asked:
> Are you aware of KCalenderSystem?

Yes - Sergio Martins helpfully brought it up a couple of weeks ago:
http://lists.qt-project.org/pipermail/development/2017-January/028241.html

Current plan is roughly to upstream it.  Debate remains as to whether it
should sit outside QDate (Lars) or be taken by overloads of QDate
methods to tweak their action (Soroush and I).

	Eddy.