re-port tex2page from v372 by building on r5rs instead of using immutable pairs
re-port tex2page from v372 by building on r5rs instead of using immutable pairs

svn: r10042

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket