Add new 'latest' data page for displays

Show latest data histograms and barometer data for given station.
This page can be refreshed and updates to show the latest data (we could also add an auto refresh to the page, so users do not need an addon/extension for that).

If the given station does not have a weather station, get weather (from same date) from another station, which is closest by number.

The page automatically resizes to fit on screen, currently expects a size of 1280x750, this needs to be made nicer, 1280x720 (hd ready) or full hd..

It clearly shows if data is older than yesterday, but not the current status of the station.

- [ ] Improve resolution (graphs are 'bitmap', do not scale nice, and expect hd-ready screen)
- [ ] Add live (current) status indicator