[racket] Scribble change, especially affects `scribble/sigplan'

Thanks! Scribble now uses those for code insets, and it now seems to
adapt correctly to different Latex styles.

At Wed, 30 Mar 2011 18:59:05 -0500, Robby Findler wrote:
> \abovedisplayskip and \belowdisplayskip?
> 
> Robby
> 
> On Wednesday, March 30, 2011, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> > I know about `\parskip' for paragraph spacing. Is there something
> > similar in [La]TeX for space around a display?
> >
> > At Wed, 30 Mar 2011 17:40:22 -0500, Robby Findler wrote:
> >> Oh. So inter-paragraph space is the same thing as the
> >> space-around-a-display? (I think at the TeX level they are different,
> >> but maybe that's only to make things more customizable?)
> >>
> >> Robby
> >>
> >> On Wed, Mar 30, 2011 at 5:38 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> >> > The `scribble/base' and `scribble/manual' styles already put space
> >> > between blocks, and so no extra space is needed. The SIGPLAN style, in
> >> > contrast, uses indentation instead of space between paragraphs.
> >> > (Actually, the SIGPLAN style has an option for using space between
> >> > paragraphs, and probably code shouldn't have extra spacing in that
> >> > mode.)
> >> >
> >> > I forgot to check `scribble/jfp'. It looks like extra space would make
> >> > sense for that one, too --- analogous to the extra space for \quote{}.
> >> >
> >> > At Wed, 30 Mar 2011 16:11:24 -0600, Robby Findler wrote:
> >> >> This sounds great! One small question: why only in sigplan conf and
> >> >> not in all --pdf generated racketblock's?
> >> >>
> >> >> Robby
> >> >>
> >> >> On Wed, Mar 30, 2011 at 3:31 PM, Matthew Flatt <mflatt at cs.utah.edu> 
> wrote:
> >> >> > As of v5.1.0.5, Scribble renders `racketblock', `codeblock',
> >> >> > `interactions', etc., in a different way than before. Indentation
> >> >> > relative to surrounding text is now implemented by a nested-flow style,
> >> >> > instead of adding spaces to the start of each line. (Using spaces was a
> >> >> > hack from before sorting out various rendering problems with nested
> >> >> > code blocks.)
> >> >> >
> >> >> > For most Scribble documents, you shouldn't notice the difference, but
> >> >> > `scribble/sigplan' mode for Latex/PDF output is an exception. The
> >> >> > Scribble style adjustments for the SIGPLAN format now introduce
> >> >> > vertical space before and after a code block. The change is intended to
> >> >> > make uses of `racketblock', `codeblock', etc., look better by default,
> >> >> > but the change could make existing documents look worse.
> >> >> >
> >> >> > To disable the extra space (because you don't like it or because
> >> >> > you've already added space in some other way), add these commands in
> >> >> > your document's Latex configuration:
> >> >> >
> >> >> >  \renewcommand{\SCodePreSkip}{}
> >> >> >  \renewcommand{\SCodePostSkip}{}
> >> >> >
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> >> >
> >>
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