- removed warnings
- added flake8 as CI target

- test run again
- notebooks not yet

- switched to google style docstrings
- removed dead code
- started to annotate types

- notebooks are considered in coverage analysis now
   -> custom notebook runner plugin adapted
- added images for documentation

- single function to create kernel for specified target
- data type creation from string - reuse numpy functionality
- bugfixes in dot display

Added DebugGui

- colored dot output of AST
- various display helpers used in documentation