Restore intensity variable to scans (#433)

This resolves #433 (closed).

enabled an automatic merge when the pipeline for 47b4a962 succeeds

aborted the automatic merge because source branch was updated

added 19 commits

• 47b4a962...a64ba4ff - 13 commits from branch main
• 69216883 - ISpecularScan: reintroduce m_intensity
• 7babf7a0 - use ISpecularScan:intensity() in SpecularSimulation
• 158e93f0 - restore scan item intensity in FromCore
• 1b1bb047 - restore scan intensity in SpecularInstrumentItem::createSimulation
• ac72990e - transmit intensity in clone fcts; add test
• 38dabd23 - twice the same fudge factor to preserve consistence test

Compare with previous version

enabled an automatic merge when the pipeline for 38dabd23 succeeds

merged

mentioned in commit 824df3bc