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Refactor xintegrator

Emanuele Roberto Nocera requested to merge refactor_xintegrator into master

Created by: APJansen

Adds a regression test for xIntegrator and refactors it to use a tensor product on the x-axis rather than replicating the grid tensor.

I expected it to be faster but the difference is negligible (few % faster).

The main point though is in preparation for other changes. I think @Radonirinaunimi 's inclusion of the nuclear pdfs will benefit from this, as well as a possible optimization for multi-replica fits I'm working on. I'm trying to put changes that will be beneficial regardless in their own small PRs, I think that'll be easier to review. (Not a lot, I think just 2 more)

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