The last commit was an accident. Revert 3 files that shouldn't have been

The last commit was an accident. Revert 3 files that shouldn't have been
committed. (And here's the missing commit log):

	* lily/simple-spacer.cc (get_line_forces): Ignore loose columns
	unless they are breakable. This fixes discrepancies between the forces
	calculated here and the forces calculated in get_line_configuration.

	* lily/grob.cc (pure_relative_y_coordinate): fix some
	mis-estimation that was happening with piano staves.

	* lily/constrained-breaking.cc (resize): don't choke if we get a
	measure that won't fit on a line.
	(combine_demerits): don't consider uniformity when ragged

	* lily/page-spacing.cc (solve): why the f* were there two of these?
	(calc_subproblem): properly handle the case where a system is taller
	than the page.

	* lily/system.cc (get_paper_system): ensure that all the permissions
	and penalties are passed to the paper systems.

	* lily/page-breaking.cc (create_system_list): support system-count.

	* scm/define-grobs.scm (pure-print-callbacks): add
	ly:script-interface::print

	* lily/page-spacing.cc (min_page_count): fix calculation of min
	pages if we are ragged and there are non-zero springs.

	* scm/layout-page-layout.scm: if the pure-height estimates are under
	the real height, allow space-systems to ignore padding if it is
	needed in order to fit the systems on one page

	* lily/optimal-page-breaking.cc (try_page_spacing): fix reading
	ragged properties
	(solve): fix performance problem. Make sure we always get at least
	one solution

	* lily/page-breaking.cc (make_pages): include write-page-breaks
	and page-stencil

	* lily/paper-score.cc (calc_breaking): remove Gourlay breaker

	* scm/define-grobs.scm: add the new slur-callback
	fix pure-relevant to not exclude grobs whose extent is already
	calculated

	* ly/paper-defaults.ly: make ly:optimal-breaking the new default
	page breaker

	* lily/slur.cc (pure_height): new callback to estimate the height
	of a slur