* Documentation/user/page.itely (Page formatting):

	* Documentation/user/page.itely (Page formatting):
	document auto-first-page-number

	* lily/page-breaking.cc (find_chunks_and_breaks):
	* lily/paper-score.cc (calc_breaking): Follow changes to the
	Constrained_breaking interface

	* lily/constrained-breaking.cc (calc_subproblem): run the main loop
	here backwards, as an optimisation
	(initialize): new function; move most of the code in resize () here
	(combine_demerits): cache ragged_right_
	(Constrained_breaking): constructor now takes the Paper_score