Some minor internal and API fixes

Frederik Hennigrequested to merge
fhennig/quickpatch into v2.0-dev
  • Fix wrong legacy imports in alignedarray, simplificationfactory and runhelper.db
  • Fix doctests that got broken with numpy 2.0
  • Disable graphviz for ASTs (not yet implemented)
  • Fix GPU periodicity function usage in data handling
  • Expose KernelConstraintsError at top-level

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