In Python2 the syntax errors were reported as printf during the parsing,
but it is different in Python3. To detect syntax errors it is now necessary
to go recursively in the tree of nodes and look for errors after the antlr parser has completed.

if a nexstate VIA is followed by an input, it needs to be parsed as a
STATE too
to be completed

Merge branch 'python3-pyside2' of https://gitrepos.estec.esa.int/taste/opengeode into python3-pyside2

due to Qt5 regressions

some more to come...

map() behaves differenly from python2

It can be installed and executed.. but many things misbehave