Update to latexml 0.8.4

[sjoelund]

No description provided.

[HansOlsson]

Looks good to me, except I don't know if the redundant "-path" setting for images is needed here as well;
and then this and the other PR needs to be coordinated I guess.
Have you checked if -path is needed here?

[sjoelund]

Where do you see -path? Or was that in the other PR?

Fatal:perl:die Perl died

	bad ns attribute! at /usr/local/lib/x86_64-linux-gnu/perl/5.26.1/XML/LibXML.pm line 1687.

	In Post::Document[A4.html] ->addNodes

	 <= Post::CrossRef[@0x55af5e25d998]

1 warning; 1 fatal error

[sjoelund]

Maybe cherry-pick these commits into #2545? Note that the Jenkinsfile runs its own latexml commands and not the ones in the makefile.

[HansOlsson]

Where do you see -path? Or was that in the other PR?

In Makefile of other PR, --path=media; so I guess it is necessary to repeat that in the CI-command as well.

[sjoelund]

That didn't seem to do it either :(

[sjoelund]

If I make derivationofstream.tex empty, it works...

[sjoelund]

It seems math context in subsection is no longer working in 0.8.4:

-\subsection{Connection of 3 stream connectors where one mass flow rate is identical to zero (N=3 and $\dot{m}_3=0$):}\doublelabel{connection-of-3-stream-connectors-where-one-mass-flow-rate-is-identical-to-zero-n-3-and}
+\subsection{Connection of 3 stream connectors where one mass flow rate is identical to zero}\doublelabel{connection-of-3-stream-connectors-where-one-mass-flow-rate-is-identical-to-zero-n-3-and}

[HansOlsson]

Looks good to me.