Add "automatic" time zone preference

Morgen (desktop as well as mobile) should support an "automatic" time zone preference.

• Ideally, this would work for desktop display as well as availability

• It would be great to have two global TZ settings, one for calendar display and one for availability, rather than every different platform having it's own TZ (which requires changing each one to keep them in sync, annoying)

• It would be even greater if both options where in the same place (e.g., preferences panel, versus having to go to online (web) profile to update availability settings)

• To make it really exciting, add a dual-time-zone display, so I can see my "home" TZ as well as my current (actual) TZ based on physical location (Google Calendar does this nicely by showing two TZ's in the margin (see picture for example)).

It's annoying to have to go into Morgen preferences and change my timezone every time I travel somewhere. Also, sometimes I forget to change the setting (if I've only moved +/- an hour or so)… which leads to confusion.

On the other hand, if it would just pick up my current time zone and adjust, that would avoid the occasional confusion and the annoyance of having to manually change it every time I travel.