Modifications for SWIG 4.0

Karel Slanýrequested to merge
swig4.0 into master

SWIG 4.0 relies more on actual Python and generates less auxiliary code. Unfortunately such code is hard-wired into the generated Python proxy classes.

Accesses to __swig_setmethods__, __swig_getmethods__ and _newclass are replaced.

addresses #1

closes #1

Edited by Karel Slaný

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