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Allow to run digitisation for asymmetric Run3 layout

Nicolas Koehler requested to merge nkoehler/athena:cscids into 21.3

Hi,

this MR adds the possibility to run digitisation for an asymmetric muon system layout for Run3 (NSW on Aside only). Within these changes, also for CSCs the IdentifierHashes now refer to the position of an Identifier in the vector of Identifiers inside the CscIdHelper. Furthermore, the MR removes the chamber layer 1 CSC chambers from the IdDictParser for the asymmetric Run3 layout since no chamber layer 1 CSC chambers are built into ATLAS (only layer 2 chambers are present since the beginning of data taking). Also the retrieval of the pslope parameter needed for the CSC chambers is simplified since previously 61440-times the same parameter was stored in the COOL database. Now, the default is to not read pslope from the database but at any time, a pslope database reflecting the number of present CSC channels can be added back if needed.

Adding @rosati, @wleight and @cchau for muon software

Adding @sroe for a final review

Edited by Nicolas Koehler

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