Altitude measurement

After the new offset configuration options are implemented, it’d make sense to instruct user on how to measure altitude changes using air pressure sensor.

User would reset first altitude offset to zero and then it’d be possible to measure altitude changes (in metres of feet) with the sensor.

This was originally an issue in consideration Feature suggestion: Altitude measurement · Issue #280 · ruuvi/com.ruuvi.station · GitHub

Reminding user of original “location” and time seems awkward (?) .

How long would this be valid before atmospheric changes invalidate the reading?