Add aartfaac rcumode

Mattia Mancinirequested to merge
mancini/DP3:add_aartfaac_rcumode into master

In this merge request an auxilliary object has been added to describe the RCU mode the LOFAR antennas are set to.

It is built on top of the merge request !1201 (merged) so that merge request should be merged first

Edited by Mattia Mancini

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