Add Pyaro EBAS reader for NILU PMF data, as well as general use

[dulte]

The NILU PMF data that I want to read is found here: https://secondary-data-archive.nilu.no/ebas/gen.h8ds-8596/EIMPs_winter2017-2018_data.zip

The files are under the "EIMPs_winter_2017_2018_ECOC_Levo" folder. The other folder can be read by PR #31, but with a new EBAS reader, that reader might become redundant

[jgriesfeller]

Note:
In principle it should have been possible to read these files with pyaerocom using the read_file method of the ReadEbas class. Unfortunately the format is slighly different to what we usually get:

from pyaerocom.io.read_ebas import ReadEbas


def main():
    filename = "/home/jang/tmp/EIMPs_winter2017-2018_data/EIMPs_winter_2017_2018_ECOC_Levo/AT0002R.20171130000000.20180809104500.high_vol_sampler.oc_ec_tc.pm25.3mo.3d.AT05L_hvs_02.AT05L_TU_sunset_001.lev2.nas"
    data = ReadEbas()
    data_out = data.read_file(filename, vars_to_retrieve="concoc")
    assert data_out


if __name__ == "__main__":
    main()

ends with

  File "/home/jang/micromamba/envs/pyadev-applied/lib/python3.11/site-packages/pyaerocom/io/read_ebas.py", line 1318, in find_var_cols
    col = self._find_best_data_column(cols, self.get_ebas_var(var), file)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jang/micromamba/envs/pyadev-applied/lib/python3.11/site-packages/pyaerocom/io/read_ebas.py", line 951, in _find_best_data_column
    raise EbasFileError(
pyaerocom.exceptions.EbasFileError: Cannot infer data statistics for data column name: organic_carbon, unit: ug C/m3, is_var: True, is_flag: False, flag_col: 11, detection_limit: 0.08 ug C/m3. Neither column nor file meta specifications include information about data statistics

We might want to discuss to which extend we reimplement the EBAS reader in pyaro-readers, e.g. should pyaro deliver the data in terms of pyaerocom variables or in terms of EBAS variables. This is unfortunately not a 1:1 relationship

[jgriesfeller]

Summary from discussion @ the pyaro-dev channel: implement seperate reader here. The original one in pyaerocom will not be working anymore as soon as the ACTRIS EBAS reader is working due to no new data.