Infrastructure modification for Muon low energy background simulation

Motivation:

The supporting structure behind the Muon detector has no thickness, as shown in the plot below.

Note: The cavern is not used in data taking, and is not yet in Simulation. It will be used for special simulations, e.g. Muon Low Energy Background, and produce the necessary parametrisation. and for Codex-beta/b

Changes:

1. A typo in Detector/compact/components/Infrastructure/trunk/Cavern.xml is fixed
2. To display the infrastructure, a small modification on Detector/compact/components/debug/Infrastructure.xml is added.

Plan:

• We need to correctly implement the magnet-supporting structure behind the Muon detector in the future.

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Validated by

• Core Software
• RTA
• Simulation