create clef for all system - bugfix
fix typo and infinite loop in selectedNote()
enhance 1.2 symbol import
tune layout rules to better match 1.2 behaviour
check for bad note head types
Note inspector head type combo box is misaligned with HeadType values:

Combo box starts from 0 and enum starts from -1: added delta to code getting and setting combo box
fix regressions test for note: bad head type
update 1.2 import regression tests!
fix barLineTo in musicxml import
allow negative staffOffset values in debugger
fix layout of cross staff beams
yet another cross staff beam fix
Improve handling of mscore/revision.h

Added a default mscore/revision.h containing "Unknown" as the
revision number (mscore/revision.h remains in .gitignore).
Removed the dependency on "revision" in the Makefiles. Now
"make revision" must be done manually if required.
Added sample post-checkout git hook to allow git automatically
to update mscore/revision.h when doing a git checkout. If installed,
this removes the need to do "make revision" manually.
make removeElement check if parent is a chord