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Cleaned up files as well.

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Update to clang-format-5 and reformat the codebase 

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This reverts commit bd6530b5.

I'm reverting the change to precision in Parameter.h for now because this is causing test failures which are out of scope for this PR.

Re #21749

Moved code from FindPeaksMD into new method on Goniometer. Then added option onto peaks workspace.

No need for exclusion ranges, so code is cleaner. There is however now recursion, so performance will need to be tracked.

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Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.

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

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