meteoio

Added the begining of an implementation of readMeteoData(data, vecMeteo, vecStation) to IOHandler. This should be mostly used for teaching purpose or for benchmarking.

An error message was added when A3DIO fails to get the COORDIN/COORDPARAM parameter (makes it much easier to track down).

The reading of ARPS files implemented in LegacyIO was not matching the files that are in used, it has been fixed (slightly different format).