make skipping of "bad" stations easy

[jgriesfeller]

We had several discussions about skipping observation stations not being easy enough. This was basically due to the fact that many exceptions occur up ti 5 calling level lower than the actual station loop. While trying to implement a skipping procedure for #636 I think I have found the smoking gun to actually make that easy.
The station loop is here:

pyaerocom/pyaerocom/ungriddeddata.py

Lines 1233 to 1236 in f1b209d

	except (VarNotAvailableError, TimeMatchError, DataCoverageError) as e:
	logger.warning(f"Failed to convert to StationData Error: {repr(e)}")
	out_data["failed"].append([idx, repr(e)])
	return out_data

As you can see there are already some exceptions that are handled. For #636 if I add the NotImplementedError exception, that station is just skipped and the code does what it should do.

The same should be possible with other exceptions.

Let's discuss that in the next user meeting

[jgriesfeller]

I think if we added StationCoordinateError to the list of exceptions, the stations with a too high distance would be ignored as well:

pyaerocom/pyaerocom/stationdata.py

Lines 368 to 374 in f1b209d

	if maxdiff > tol:
	raise StationCoordinateError(
	f"meas point coordinate arrays of {key} vary "
	f"too much to reduce them to a single "
	f"coordinate. Order of difference in {key} is "
	f"{maxdiff} and maximum allowed is {tol}."
	)

[jgriesfeller]

clarified by #652. closing this issue since the primary suggestion has been implemented through #641