support.
This option prevents section labels from being numbered after the third
level.
make FORMATS=ps :
"N.N.N Section Title"
"N.N.N.N really specific topic"
"N.N.N.N.N really-really specific topic"
make MIN_SECT_LABELS=1 FORMATS=ps :
"N.N.N Section Title"
"really specific topic"
"really-really specific topic"
The section titles are still bold, spaced away from the text, and
sized according to their nesting level.
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