Port the power spectrum calculation code from the FLAMINGO fork

Does what it says on the tin...

All the FLAMINGO runs used this code.

added SPH enhancement labels

assigned to @bvandenbroucke

@bvandenbroucke: Not urgent at all. Review welcome if you think something needs improving. It should already be well-tested.

added 21 commits

• 7552f5a4...09680f6c - 20 commits from branch master
• 1a5bee06 - Merge branch 'master' into add_PS_calculation

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All good points. Let me see whether the code can be simplified.

added 3 commits

• 1a5bee06...2c500678 - 2 commits from branch master
• 222495b7 - Merge branch 'master' into add_PS_calculation

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added 2 commits

• 1a1af63e - 1 commit from branch master
• 6b331aa7 - Merge branch 'master' into add_PS_calculation

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added 1 commit

• a3320db8 - Remove C++-style comments. Move the row_major_id_padded function to the row_major_id.h file

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added 1 commit

• 61f64e1e - Add a comment about the usage of the FFTW plan

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added 2 commits

• 7c832d32 - Clean-up duplicated code in the power-spectrum initialisation. Also remove the power_window enum
• c44c9ddb - Move all the common code selecting particles for the assignment or the...

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added 1 commit

• 000d569b - Document the new function

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added 1 commit

• 543378a7 - Rearrange the ordering of some functions in power_spectrum.c

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added 1 commit

• 4707030f - Add some comments to explain the code flow

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This new version should address all the comments from above.

resolved all threads

approved this merge request