Hi all,

The patch below allow's you to provide your own shell command the
generates HTML from a latex fragment and places the output directly in
the exported HTML file.

I've added this feature to be able to use latexml for processing latex
fragments to HTML. Unfortunately, mathjax can't process macros from the
siunitx package, but latexml can. Here's how I use it

  (setq org-html-with-latex 'html)
  (setq org-latex-to-html-convert-command "latexmlc 'literal:%i' --profile=math --preload=siunitx.sty 2>/dev/null")

Any/all feedback appreciated!