Extend UBB

For the UBB boundary condition, the density at the wall is calculated from the PDFs at the wall. With this MR the density can also be prescribed by the user

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requested review from @da15siwa

assigned to @holzer

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• fc0980f7 - Extend UBB

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• fc0980f7...d88e9cff - 2 commits from branch pycodegen:master
• 4f154d00 - Merge branch 'master' of i10git.cs.fau.de:pycodegen/lbmpy into UBB

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• b48db38e - Extended documentation

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• 3a7f0f5b - Corrected math notation

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• 38a5ce99 - Added more equations

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• 308dae7a - Changed documentation

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requested review from @schottenhamml

mentioned in commit b3d37b73

merged