Finally adressing issue 72 with second resolution in dates. The ISO strings now contain the seconds when written out and by reading them, the seconds can be provided (but this is not mandatory). In ARC, grids are now named with the seconds (except when enabling the Alpine3D naming scheme). The adresses a bug that was found when requesting" raw" processing level from a plugin that constructs its timestamps from a decomposed time: time-1s and time+1s were the same and therefore this could trigger problems in the plugin.