Convert landings to format format provided by readLssFile.
convertToLssData(LandingData)LandingData landings to convert
converted landings. See readLssFile for format
When converting from lss:
All columns of 'lssLandings' are populated, except 'salgsdato' and 'versjonstidspunkt'.
All columns of LandingData are converted, except 'DokumentFormulardato' and 'DokumentElektroniskDato'.