v492-12 Add XGB energy reconstruction

[GernotMaier]

No description provided.

[Copilot]

Pull request overview

This PR adds XGBoost (XGB) energy reconstruction capability by introducing a new get_Erec() method to the CData class that can return energy values from different reconstruction methods. The implementation adds support for retrieving energy from a friend tree (Dir_Erec), which enables the XGB reconstruction method alongside existing methods (Erec and ErecS).

Key changes:

• Added get_Erec() method to CData class with support for multiple energy reconstruction methods
• Refactored energy access throughout the codebase to use the new method instead of direct member access
• Added Dir_Erec member variable to store XGB reconstruction results from friend tree

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
inc/CData.h	Added Dir_Erec member variable and get_Erec() method declaration
src/CData.cpp	Implemented get_Erec() method with 4 different reconstruction method options and initialized Dir_Erec
src/VTMVAEvaluator.cpp	Replaced direct ErecS access with get_Erec() calls
src/VStereoAnalysis.cpp	Updated tree filling to use get_Erec() instead of direct ErecS access
src/VInstrumentResponseFunctionData.cpp	Refactored to use get_Erec() with explicit method parameter
src/VGammaHadronCuts.cpp	Simplified getReconstructedEnergy() to delegate to get_Erec()
src/VEffectiveAreaCalculator.cpp	Refactored energy reconstruction logic to use get_Erec() with method parameter
src/VDataMCComparision.cpp	Extensive replacement of direct ErecS access with get_Erec() calls throughout histogram filling
pytest.ini	Removed pytest configuration file

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