Fixes the input validator for MostLikelyMean

Muon - Core Code; New Load Utilities

Generalization of SampleLogsBehaviour (MergeRuns, ConjoinXRuns)

Indirect Bayes - ResNorm adjustments

New algorithm ParallaxCorrection

Add Load Button to SANS GUI

Add xvfb to system test calls

Bugfix gui remembering linear/logarithmic binning

This is a follow on to #24057

Decref Python object after copying to C++ std::string

Checks for muon analysis x range

MergeRunsTest seem to need the definition of the static variables.
ConjoinXRuns should be fine.
In best case, tests from MergeRunsTest should be moved to SampleLogsBehaviour to avoid the namespace

Refs #23947

PyString_AsString simply returns the pointer to the underlying
character string so the Python string object needs to be kept
alive until it can be copied into the C++ std::string object

after class declaration

Refs #23947

Muon - Algorithm; MuonPairingAsymmetry

Refs #23947

- no hard-coded default paramter names in constructor of SampleLogsBehaviour
- independent and more general SampleLogsBehaviourTest
- parameter name definitions are now in algorithms header and will be defined in corresponding source file.
- reverting changes of MergeRunsTest

Refs #23947

Plot advanced against most properties

Allow user to specify max iterations and make partial spectra fitting more flexible.

Refs #24162

Refs #23773

Refs #23773