Add check to convert PropertyManager value directly to pointer (ornl-next)

Modernize CalculatePlaczekSelfScattering (ornlnext)

* Move slow LoadWANDSCD unittest to systemtest

* Update Testing/SystemTests/tests/framework/LoadWANDSCDTest.py

Co-authored-by: StephenSmith25 <56431339+StephenSmith25@users.noreply.github.com>

Merged as ORNL companion to #32130 which has been merged.

The previous version used the same b_tot^2 for all elements, effectively
splitting the sum into the product of two sums. It was not noticed
before because the unit test was for a single element material, Si,
where the sum only has one value.

SetSampleFromLogs (ornlnext)

Add normalization as optional path in data loading

LoadEventNexus stops reading logs (ornlnext)

Pd288 multi sactter sample only

The Gitlab user story contains an incorrect formula

Co-authored-by: Ross Whitfield <whitfieldre@ornl.gov>