sync with experimental

manual/luatex-callbacks.tex

manual/luatex-math.tex

manual/luatex-nodes.tex

manual/luatex.pdf

manual/luatex.tex

source/texk/web2c/luatexdir/font/texfont.w

source/texk/web2c/luatexdir/lua/lcallbacklib.c

source/texk/web2c/luatexdir/lua/lpdflib.c

source/texk/web2c/luatexdir/lua/luanode.w

source/texk/web2c/luatexdir/luatex.c

source/texk/web2c/luatexdir/luatexcallbackids.h

source/texk/web2c/luatexdir/pdf/pdfgen.h

source/texk/web2c/luatexdir/pdf/pdfliteral.w

source/texk/web2c/luatexdir/pdf/pdfrule.w

source/texk/web2c/luatexdir/tex/commands.w

source/texk/web2c/luatexdir/tex/dumpdata.w

source/texk/web2c/luatexdir/tex/equivalents.h

source/texk/web2c/luatexdir/tex/errors.w

source/texk/web2c/luatexdir/tex/extensions.w

source/texk/web2c/luatexdir/tex/mlist.w