parse_test.go: Change %s to %q
Begin grouping section tests
Rename section_level_good tests
Rename section_level_bad tests
Rename section_level to just level
Move remaining section tests into groups
Give title_{good,bad} new number prefixes
Add number prefix to title_{good,bad}
Add prefix to level_{good,bad}
Add prefix to title_with_overline_{good,bad}
Add prefix to title_numbered_good
Add prefix to title_with_inline_markup_good
Finish renaming section test prefixes
Make directory prefixes sequential
Remove nbl from name in bad section overline test 02.01
Fix bad name for section oveline test 02.01
lex_test.go: Update for renamed tests
Finish renaming section tests