fix #39536 - Crash when opening MusicXML produced in PhotoScore
add testfile
fix #39751: selection / deletion of chord symbols
add mtest
Merge pull request #1473 from MarcSabatella/39751-chord-select

fix #39751: selection / deletion of chord symbols
Merge pull request #1472 from lvinken/39536-musicxml-divisions

fix #39536 - Crash when opening MusicXML produced in PhotoScore
fix #20783: add section breaks to joined scores

and line and page breaks too...