GDP linebreaks inside long @code{} stuff

[Graham Percival]

Is it worth fussing with spaces in @code?  I'm thinking of things
like @code{\include "english.ly"}.

I tried making a @longcode{} which does @address@hidden, but that fell
afoul of the inconsistent backslash-in-macros texinfo problem.  (\
is fine for pdf, but \\ is required for html output)
Writing @address@hidden "english.ly"} would solve that
problem, but at this point I started to wonder if I was obsessing
too much over small details.  :|


Another solution is just to include @w{} in the list of commands
for doc helpers, and encourage people to write @address@hidden
lilypond command with arguments}}.

Cheers,
- Graham