If the 'nols' option were set, the files could be output with plain
LaTeX as well; but because letterspacing is an important part of the
Tufte design, letterspacing is preserved and pdf2 is set as the
default output format. This is now explained in a note.
(cherry picked from commit
1b7e9178f071a1abdbd6ecea3e60ae28a284b4ec)
\font_tt_scale 100
\graphics default
-\default_output_format default
+\default_output_format pdf2
\output_sync 0
\bibtex_command default
\index_command default
\font_tt_scale 100
\graphics default
-\default_output_format default
+\default_output_format pdf2
\output_sync 0
\bibtex_command default
\index_command default