2021-A

Fixed

• Fixed support of latexindent
• Fixed support of xindy

Changed

• Switch upstream image to Island of TeX's texlive image
• Switch to TeX Live 2021
• Update pandoc to 2.12.1
• The working directory for latex compilation is now /workdir instead of /home. /home is kept for plantuml.jar and other local pacakges.

Removed

• Remove support of pax, because there is newpax
• Remove Python, because it is not required in a default setup
• Remove pdftk and ghostscript. Seems to be used only in rare cases.