+/- 1h time shift of the SWR at most stations

[BaptisteVandecrux]

Although the time shifts have been addressed using diurnal variation of TA, both using side AWS and RACMO RCM, the ISWR still seems to drift by 1-2 hours at many sites, either compared to RACMO SRin or compared to the previous years of data.

This could be due to the tilt of the radiation sensor, which changes the phase of measured ISWR.

Will need to check if RIGB tilt correction can fix that.