Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

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Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

May want to pass workspace indices, so int64_t is generally better,
probably?

To be used by ExtractSpectra2.

The files are yet to be renamed

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

Reverts commits 959cabbc, c891ad84, e2f375fa, 2f832c21.

The clone is not in the ADS, after all.

Re #21064

Re #21064

Merge to ensure CrystalFieldFunction is available and up to date.

Refs #20352

* Implement it in Algorithm.
* The implementation in AlgorithmProxy now inherits from IAlgorithm.

Re #21064

Re #20790

Re #20790

Re #20790

Re #20790

Re #20790