replaced _undo->push() with undo() in Score::transposeKeys()
add trackName tag in instruments.xml, use first longname when not available, store description
fix memory leak in Score::Score(Score*)
Merge pull request #271 from heuchi/20507_crash_in_transposeKeys

Fix #20507 changing concert pitch state of newly created part crashes
always use the root score undo stack
Implement "Show clef" in "Edit Staff Types" dlg box for all types, not only for TAB's
fix #17445, add regression test for repeats
Staff Type Dlg Box - TAB: Remove "on_" from slot names.


Qt uses the prefix for automatic signal-slot matching and generates run-time warnings if no match is found.
Merge pull request #275 from mgavioli/TAB_type_edit_slot_names

Staff Type Dlg Box - TAB: Remove "on_" from slot names.
fix #20508: Clefs and key sigs drawn wrongly in palettes
fix #20424: Impossible to delete a custom barline
fix #20541: Part not visible if created when viewing part. Rename buildin to builtin workspace
added nullpointer check in Seq::setPos(int) to avoid crash
fix #20423: Crash when deleting start repeat in the first measure
Merge pull request #277 from heuchi/10050_crash_in_pa

Fix #10050
do nothing fancy with barline and accolade when splitting staff
fix #20558: Split staff creates incorrect results
fix #10827: Clef changing
fix #20233: Pedal marks not deletable
fix #19287: Removing and adding linked staff and creating score causes crash