Refactor source tree layout

Similar to pystencils the source tree layout of lbmpy is adapted to newer standards

requested review from @da15siwa

assigned to @holzer

added 1 commit

• bbda5637 - Small changes

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• 329e3825 - Fix conda pipeline

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added 1 commit

• b7078ceb - Fix linter

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added 1 commit

• b6408920 - Fix quicktests

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added 1 commit

• 1ed3d8c9 - Add init py

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added 1 commit

• 9ff27945 - Fix missing import

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• 8a5dee1f - Update .gitlab-ci.yml

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• 7b1c5284 - Modernized poiseulle flow

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added 3 commits

• 7b1c5284...b3d37b73 - 2 commits from branch pycodegen:master
• 93efab76 - Merge branch 'master' into SrcTree

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enabled an automatic merge when the pipeline for 93efab76 succeeds

mentioned in commit 3e141d5b

merged