PI_xrealweather -Estabilizar la meteo

SHORT DESCRIPTION

- even newer: sets wind layers in respect to cloud layers
- new: can correct the wind direction related to altitude
- downloads the MOST RECENT Real-Weather for the SIMULATED time
- downloads ONLY if the DATA is not already on the disk OR if realtime is chosen.
- saves the METAR with a timestamp, so you can keep a full year cycle if you want.
- applies a filter to get the most reliable METAR sets for the given time.
- applies a filter to get correct visibility, if the METAR reports "CAVOK" instead of "9999"
- applies a filter to correct corrupted wind data.
(This faulty data can cause absurd windspeeds in some places.
Madeira (LPMA) is one of them, if you feel like trying.)
- lets you chose the sim speed up to 6x