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.

due to Qt5 regressions

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

calls to setParentItem make Qt crash if the new parent is not in the
same scene as the item.

such as "integer", "real" which are Ada names

As per GMV request

QGraphicsTextItem supports only external links when clicking on a
hyperlink

Procedure textually declared were being duplicated in the autocompletion
list each time the symbol was edited