Automake proximity minitrees

[Jelle Aalbers]

It would be nice if cax could build the proximity minitrees automatically, so we can start defining cuts on e.g. the proximity of a busy, or muon veto trigger, or the previous event (like the time difference cut in XENON100).

It's not as simple as adding it to the list here:
https://github.com/XENON1T/cax/blob/master/cax/tasks/process_hax.py#L54

as this minitree needs access to the raw data. That means we have to set raw_data_local_path correctly here:
https://github.com/XENON1T/cax/blob/master/cax/tasks/process_hax.py#L23

However that probably depends on which site hax is running, or can perhaps bubble up from the deeper circles of cax.

[Patrick de Perio]

Added in eea9827

And I guess hax is initializing raw_data_local_path properly by default already (since we've been getting the Proximity minitrees for a while now).