Average zenith or azimuth for GRB runs with inter-run repointings

[GernotMaier]

Not highest priority, but we should keep it in mind:

V2DL3/pyV2DL3/eventdisplay/fillEVENTS.py

Line 62 in f160ee7

avRA = np.mean(raArr)

This will not work for GRB runs, where we repoint the telescopes in the middle of the runs.

• could solve it already before on the anasum stage
• add time cuts to the fillEvents?