Ability to display real atmospheric pressure

Submitted by sa-..@..bow.by

Assigned to Harald Judt

Link to original bug (#12945)

Description

Please add the ability to display real atmospheric pressure.

Forecast exchange uses pressure data calculated for sea level. One can compare it to real barometer reading using barometric formula:

https://en.wikipedia.org/wiki/Barometric_formula

You could use simplified equation without temperature lapse rate, using pressure and temperature only. "Real/sea level" switch could be implemented either as hidden option or gui checkbox.

Version: 0.8.8