Change in_construction

[PythonFZ]

ZnFlow/znflow/node.py

Line 57 in ee5e46e

cls._in_construction = False

We could change in_construction in such a way, that it is true until the __init__ was called? This way also things like __subclass_init__ should be covered. See zincware/IPSuite#51

[PythonFZ]

See https://docs.python.org/3/reference/datamodel.html#creating-the-class-object