id_method given/input
In case there is already some kind of register in place (ID created from dates taken from the research data) the user might not want to have an ID created, but input the ID.
If the ID is generated by the data, it should be accessible via a variable, in which case we should add it as another keyword argument of tagplot.
Using "time" or "random" as 'id_method' makes no sense with a "given" ID, so we either need to throw an error if the id_method is set to one of these (or rather if it is set to something apart from "given/input" or not set at all).
- Set no id-method, but input a 'handover_id' --> overwrite default id_method
- Set id_method to 'handover' and set a 'handover_id' -> fine
- Set id_method to 'random' and set a 'handover_id' -> error, mention prefix option?
- Set id_method to 'handover' but don't set the id -> ask for input (manual?)
'handover' might not be the best, 'input', 'given', 'external' ... something like that?