duplicating changes from jdpipe/gs-netstream

[jdpipe]

I need more info to follow the instructions about pull requests, so I'm making this one anyway!
("with OpenModelica/OMCompiler/3rdParty submodule pointing at your commit" = ?)

graphstream/gs-netstream#10

Note that the OpenModelica workflow does not use pull requests for this repository:
https://github.com/OpenModelica/OpenModelica/blob/master/CONTRIBUTING.md

Pull requests are still fine for things like documentation changes that
do not affect building OpenModelica, but there is very little
documentation here.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}