VP1: Add support for loading config files (missing since CA move)

Also:

• Make Filename optional (this is still not perfect, since we used to be able to pass multiple files). This also meant I had to move HLTP check to after empty filename check, otherwise the autoconf kicks in and fails.
• Fix AtlasExtrapolation error reported in ATLASVPONE-659
• Misc minor fixes

cc @rbianchi

changed the description

changed target branch from main to 24.0

changed the description

This merge request affects 4 packages:

• graphics/VP1/VP1Algs
• graphics/VP1/VP1Base
• graphics/VP1/VP1Systems/VP1GeometrySystems
• graphics/VP1/VP1Systems/VP1GuideLineSystems

Affected files list will not be printed in this case

Adding @rbianchi as watcher

added 24.0 EventDisplay review-pending-level-1 labels

WARNING: big files (>100K) are found in the changeset

108K in file graphics/VP1/VP1Systems/VP1GeometrySystems/src/VP1GeometrySystem.cxx

CI Result SUCCESS (hash e8528fc6)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5143]

Looks good to me. L1

added review-approved label and removed review-pending-level-1 label

added review-approved-point1 label

mentioned in merge request !69195 (merged)

added review-approved-tier0 label

mentioned in commit 03155fad

merged

mentioned in merge request !69214 (merged)