Add argument to allow the selection of the tool for the gain selection

[marialainez]

By default, lstchain_r0_to_r0g will be used for dates later than 20231205 and lst_dvr for dates previous to it. But if we want to use e.g. lstchain_r0_to_r0g for a date previous to 20231205, we can do it now using the argument "tool". This is necessary for some days of November of 2023, in which some data was taken with EvBV6.

[morcuended]

Looks fine, but I leave some comments in case they are helpful to improve the code usability

[morcuended]

Also, it might be good to change the name of the script if it will be running both gain selection and DVR?

[marialainez]

This script at the moment is not used to run the DVR, I think the script "lstchain_r0g_to_r0v" should be used for that, which we don't use here.

[morcuended]

isn't it the lst_dvr then doing actually DVR? (ok, it is just the name for the "old" data, it's actually doing both things, no?)

[marialainez]

lst_dvr can do both things, gain selection and dvr, but in this script we only use it for the gain selection:

[lstanalyzer@tcs06 lstosa]$ lst_dvr --help
Tool to apply gain selection and data volume reduction to LST R0 zfits files

Usage for DVR including gain selection:
lst_dvr <input file> <output directory> <pixel selection file>

Usage for gain selection only:
lst_dvr <input file> <output directory> <reference time> <reference counter> <module> <preferred trigger source>

[morcuended]

Understood. I think it is good to go, test failed is unrelated, due to a difference in the time shown in the sequencer table (happens from time to time)