Generate iCal file with floating events, i.e. without timezone normalization to UTC-0. This should be optional -or- we should test whether we can generate iCal files without normalization to UTC-0, but with timezone information (instead of Z = UTC-0), and check if this enables importing the events as floating events.

Submitted by Elmer van Chastelet on 9 January 2018 at 16:15