add support for ATOLL, Barcelona, Athens, Hyytiala, Dublin stations ; housekeeping ; update user manual

add support for ATOLL, Barcelona, Athens, Hyytiala, Dublin stations ; housekeeping ; update user manual

- changed missing T and RH in lev0 from 0.0 to missing value
- Fix Torr -> hPa unit conversion between 0b -> 1b
- handle extra lines added by windows line breaks vs LINUX ones

- uncertainties added in lev1b + lev2b ; fix number of variables and related metadata (fill values, scaling factors) in lev2b

- format updates