* lily/spacing-spanner.cc (set_springs): add support for

* lily/spacing-spanner.cc (set_springs): add support for
common-shortest-duration field.

* lily/parser.yy (translator_spec_body): allow \set in \translator
{}  block. This is the same as \override, here.

* lily/score-engraver.cc (one_time_step): don't warn about columns
when skipTypesetting == #t.

* lily/spacing-spanner.cc (musical_column_spacing): change
ragged right function to produce natural spacing.