Improvements to the particle-multipole interactions

For multipoles of order p, we can compute the forces of this multipole onto a particle using derivatives of the potential of order p+1. This leads to additional accuracy without having to carry additional multipole values.

added 23 commits

• baf6cf1d...abe15cbd - 19 commits from branch master
• 4340e825 - Accelerations from M2P now use derivatives from one order higher than is computed for the multipole
• c569ffe1 - Updated potential_derivatives_M2P
• 50ef86b9 - Left over endif
• ea83c29d - Updated + to +=

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• fe44f590 - Code formatting

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• 1865c4ec - Extended the gravityDerivatives test to also verify the M2P terms.

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• 801b082f - Also add the additional order calculation in the P2M of the 'potential' gravity.

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• 002f4be0 - Use the correct += and not = whend adding the 4th-order contribution to M2P.

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• 71ff1f7e - No unnecessary pre-initialisation of the the D's in potential_derivatives_compute_M2P()

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• aa9d7e13 - Use the correct multipole order in the gravity derivatives unit test.

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changed title from M2p update to Improvements to the particle-multipole interactions

changed the description

added enhancement SPH labels

merged

mentioned in commit 0aaf4486