Table view (with German environment) displays pressure with '.' instead of ','

[Jens-Uwe Grooß]

The display of decimal numbers in table view is not consistent. In the German system environment, the numbers should be displayed with a comma "," and they can be changed by entering the number in this format. This works for Lat, lon, and FL, but pressure is displayed with "."

[Reimar Bauer]

Switch pressure formatting in tableview to Qt

Fix issue #305

→ <<cset 8768fe63bfe3>>