Change the "--selected-stations" option in the csv2obsoul command to
"--selected-stations-fpath". This is to make it more obvious that this
refers to a file path.

The old syntax using "--selected-stations" should still work though, as
argparse tries to match the options from passed abbreviations.

Caused by a reference to select_stations before the variable had been
defined.

To simplify the code and fix an unpacking error in the csv2obsoul
command.

They already get shortened when reading data in read_netatmo_csv (which
is used by all other file reading routines so far in netatmoqc).

This should solve the issua at FMI with failure for integer station IDs.
See issue <#3>.

This is a merge commit.
The previous commit in the branch was 22e5a889

And fix an issue with retrieval of DTG metadata in save_df_as_obsoul.

pylint didn't seem to have the correct version in the gitlab CI run; I
suspect it is due to some environment misconfiguration.

To reduce clutter in pyproject.toml

Fixes crash in app when choosing outlier_removal_method=None.

Caused by changing the type of the "skip" arg from list to tuple.

Fixes, for instance, crash in LOF outlier removal, as it needs to use a
subspace of the distance matrix and extracts the needed indices from the
indices of the dataframe, assuming it ranges from 1 to len(df.index).

As clustering already imports from outlier_removal. It was allowed to do
it the way it was, but this way is less convoluted.

Attribute "metadata_dict".

Separate grid- and projection- related properties in Domain.