* Documentation/topdocs/NEWS.tely (Top): add note for

* Documentation/topdocs/NEWS.tely (Top): add note for
string-finger feature.

* scm/define-grobs.scm (all-grob-descriptions): add 'string-names
property.

* scm/output-lib.scm (string-finger::calc-text): read 'digit
instead of 'text

* input/regression/script-stack-horizontal.ly: new file.

* ly/engraver-init.ly: add Script_row_engraver.

* lily/script-column.cc (order_grobs): refactor: separate axis
independent code.
(row_before_line_breaking): new function.

* lily/script-row-engraver.cc (Script_row_engraver): new file.

* scm/define-grobs.scm (all-grob-descriptions): add ScriptRow