Added handling of NetCDF time resolutions different from one day in importSEAPOpred().
Fixed SESformat row names importation and namespace (scatterplot3d not used yet)
Correct argument name in summary.ses
Fixed abs bug with POSIXct objects
Improved readability of warning message (no NetCDF file on ...)
Added description of data variables in extdata. Set up new functionality of extractBiom (week resolution & averaged daily locations).