Merge branch 'master' into oseenfrankmisunderstanding

to get proper pandoc md to pdf output

notes/plans/.maindir

+../..
\ No newline at end of file

scripts/md-preamble.tex

+\AtBeginDocument{\renewcommand{\setminus}{\mathbin{\backslash}}}

scripts/pandoc-gitlab-math.lua

@@ -3,7 +3,7 @@
 -- function of Firefox
 -- or
 -- you can use pandoc with this filter and lualatex as the engine like so:
--- pandoc --pdf-engine lualatex --lua-filter .maindir/scripts/pandoc-gitlab-math.lua in.md -o out.pdf
+-- pandoc --include-in-header=.maindir/scripts/md-preamble.tex --pdf-engine lualatex --lua-filter .maindir/scripts/pandoc-gitlab-math.lua in.md -o out.pdf
 -- This is a small part of the complete gitlab-flavored markdown to pdf via pandoc scheme by https://gist.github.com/MyriaCore/75729707404cba1c0de89cc03b7a6adf
 function Math(el)
     if el.mathtype == "InlineMath" then