Make start-repeat bar lines to follow all staff span data.

Start-repeat bar lines only follow the staff span value, but not the spanFrom and spanTo values.
If the span data of a staff indicate a multiple span and a bar line is custom-shortened to span less staves, the 'uncovered' staves lack their bar line(s)
Added test.
Merge pull request #598 from mgavioli/startrepeat_barline_to_follow_staff_span_data

Make start-repeat bar lines to follow all staff span data.