sync with experimental

manual/luatex-languages.tex

manual/luatex-libraries.tex

manual/luatex.pdf

source/README

source/build-aux/config.guess

source/build-aux/config.sub

source/build-aux/texinfo.tex

source/doc/ChangeLog

source/doc/README.solaris

source/doc/build-tools.txt

source/doc/tlbuild.info

source/doc/tlbuild.texi

source/libs/README

source/libs/cairo/ChangeLog

source/libs/cairo/Makefile.am

source/libs/cairo/Makefile.in

source/libs/gmp/ChangeLog

source/libs/gmp/Makefile.am

source/libs/gmp/Makefile.in

source/libs/libpng/ChangeLog