See #3432. Previously the parser didn't handle properly this case: * - a - b * - c - d
These were confusing. Now we rely on the +raw_tex or +raw_html extension with latex or html input. Thus, instead of --parse-raw -f latex we use -f latex+raw_tex and instead of --parse-raw -f html we use -f html+raw_html
Closes #3422.
