Bugfix: stationmeta search options don't combine with limit
Example: https://toar-data.fz-juelich.de/api/v2/stationmeta/?country=NL,DK&limit=2 doesn't work; parameter "limit" is not supported.
Also true for timeseries: https://toar-data.fz-juelich.de/api/v2/timeseries/?sampling_frequency=Hourly&variable_id=19&limit=10
and for search: https://toar-data.fz-juelich.de/api/v2/search/?sampling_frequency=Hourly&variable_id=5&country=DK&limit=10