* lily/break-substitution.cc (fast_substitute_grob_array): do

* lily/break-substitution.cc (fast_substitute_grob_array): do
fast_substitute_grob_array for all unordered grob_arrays.
(substitute_grob): return Grob *. Saves packing/unpacking SCMs.
(substitute_grob_array): optimize.

* lily/align-interface.cc (set_axis): set ordered_ for 'elements

* lily/include/grob-array.hh (class Grob_array): ordered_ member.

* lily/parser.yy: revert $globalheader patch.

* lily/engraver-group-engraver.cc: remove engraver_each,
recurse_down_engravers ()