LArRawConditions: Add index tracking for LArMCSym.

Extend LArMCSym so that it can also return the index of the symmetric cell in the list of all symmetric cells.

Add a unit test for it.

This merge request affects 1 package:

• LArCalorimeter/LArRawConditions

Adding @pavol as watcher

added JetEtmiss LAr master review-pending-level-1 labels

CI Result SUCCESS (hash 1a3887c7)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 9900]

merged

mentioned in commit 8c143b1d

added sweep:ignore label