* texinfo.tex (\writetocentry): New macro.

	* texinfo.tex (\writetocentry): New macro.
	(\chapternofonts): No longer needed.
	(\chapter, ..., \unnumberedsubsubsec): Change all the sectioning
		commands to call \writetocentry instead of doing it inline.
	Also, do not call \chapternofonts, we avoid expansion with
		\the\toks instead.
	(\opencontents): No longer needed, instead \writetocentry opens
		the file when necessary.
	(\setfilename): Don't call \opencontents.
	(\ifsetcontentsaftertitlepage, \ifsetshortcontentsaftertitlepage):
		New conditionals.
	(\Etitlepage): Call \contents and/or \shortcontents if
		conditionals are set.

	Global: use \nobreak instead of \penalty 10000 for epsilon efficiency.