Big update for planetary stuff

Lots of minor and some major updates and tweaks, including bug fixes for particles running out of neighbours and non-periodic boundaries, some of which are crude and temporary.

Planetary simulations are now running successfully!

Also removed the examples since they need serious updating, to be replaced with functional versions soon.

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• 00ce2383 - Check that label_first is not negative

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What is the difference between Density-Energy-SPH and the MultiMat one?

And do we need both? More code to maintain is always a pain.

DensityEnergy includes Balsara. At the moment that's the only difference, but I figured that it was worth keeping a minimal SPH version separate from the DensityEnergy that we can use to play around with things like viscosity.

I also need to update it with everything that's changed in MinimalMultiMat, which like you say is a pain since apart from the few viscosity lines they're currently identical.

Well my question is then whether it is worth keeping both? Maintaining both of them might be painful in the long run and if only one is actually used that's just dead code.

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• 0512969f - Fix typo in the HM80 EoS

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• 771182bd - Prevent FPE from mutlipoles with only zero-mass particles that have left the box

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• 4c83a0a0 - Leave out-of-box particles' positions unchanged to avoid breaking the tree

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changed title from Big update for planetary stuff to (WIP) Big update for planetary stuff

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marked as a Work In Progress

changed title from (WIP) Big update for planetary stuff to WIP: Big update for planetary stuff

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• 85c7c8de - Remove the DensityEnergy scheme and add its Balsara switch to MinimalMultiMat as…

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• 2dc6bfcf - Remove the DensityEnergy scheme and add its Balsara switch to MinimalMultiMat as…

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• 99a7c119 - Rename the MinimalMultiMat hydro scheme to Planetary, since it'll no longer…

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unmarked as a Work In Progress

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• 53d78f5e - Rename the MinimalMultiMat hydro scheme to Planetary, since it'll no longer…

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• 8d112a6e - Update with the new hydro scheme name

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• 0dcbe2b6 - Update with the new hydro scheme name

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