Changed removal of spanner in range selections.
Slurs are removed when start or end segment are removed.
Other spanners are removed if the start segment is removed.
Added test suite for selection range delete.
Added tests for range delete of spanners, and slurs.
Changed highlighting for spanners.
Hide naturals in key signature
Revert to long instrument name if no short name
build system: add find_package for Qt
partial fix for #23324
update mtest
travis install cmake 2.8.9
revert CMake changes
Allow both Shift and Ctrl drag modifiers.

At least for bar line dragging, Shift-dragging can co-exist with Ctrl-dragging: allow detection of either, if both.
Fix merge conflict and modif. check for bar lines separate from other elements.
add 'apply to all parts' button in page settings
add 'apply to all parts' button to text style and general style editing dialogs
TAB entry mode: Sync current note with string cursor.

In TAB entry mode, while moving the string cursor up or down, the current (selected) note remains the last inserted note, with the following inconsistency:

- new notes are entered at the string cursor
- but cmds affecting a note (pitch up/down and like) changes the selected note;

this is likely to lead to confusion and unexpected results.

With this fix, when the string cursor is moved up/down and a note is found at the new string, it is made current (selected). If there is no note, the selection remains unaffected.

Note: Also corrected a typo in the name of a StaffType method.
export correct creditwords justify and valign attributes
fix typo in cmake file
fix #26776
fix #26971: Seek now works after repeat
fix #26966: 'Play repeats' button works