Prettyprinter sections must subclass section, and they must also obey a protocol.

Layout queries:

section-fits? ( section -- ? )

indent-section? ( section -- ? )

unindent-first-line? ( section -- ? )

newline-after? ( section -- ? )

short-section? ( section -- ? )

Printing sections:

short-section ( section -- )

long-section ( section -- )

Utilities to use when implementing sections:

new-section ( length class -- section )

new-block ( class -- block )

add-section ( section -- )