Drop-in python version, ported from the pascal version#2

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wvvelzen wants to merge 3 commits intonjonchee:mainfrom

wvvelzen:python_version

Commits on Dec 15, 2022

Drop-in python version, ported from the pascal version
wvvelzen
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Commits on Jan 31, 2023

Add ^Z character to end of written nodelist segment files.
wvvelzen
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Commits on Feb 21, 2023

Added DELNODE feature. This serves to delete specific nodes from the nodelist segments it checks, specified by node number.
wvvelzen
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