to be further tested, but we should be able to extract automatically the D3.js output as SVG (and then render to PDF using inkscape foo.svg --export-pdf=bar.pdf)

Work around dependency issue for matrices, add function counts.

'int' are not allowed anymore in last operations for these fragments

This resulted in root() being accepted in downward-basic but not in -last.
The issue is the same as in 784dee34.