DescriptionMove grid-line-interface to Scheme.
* remove grid-line-interface.cc/.hh
* use Pointer_group_interface::add_grob () as replacement for
Grid_line_interface::add_grid_point ()
* add grid-line-interface & grid-point-interface to define-grob-interface.scm
* add library function for retrieving 'thickness scaled according to
staff-symbol line-thickness, grob::scaled-thickness
* implement grid-line-interface::print/width in output-lib.scm
Patch Set 1 #Patch Set 2 : Use for-each to unite points. #Patch Set 3 : Fix indentation. #
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