fix regression tests
fix build on windows
fix build on Mac OSX
removing a duplicate entry in instriments.xml

and fixing a typo
updating instr_language.xml

to match the latest version of instruments.xml
fix #20991 : Ledger line of normal note shortens if small note is above
Merge pull request #352 from Jojo-Schmitz/instruments.xml

Instruments.xml
Fix #21069 - Opening the "Create | Instruments.." dlg box causes crash.
Merge pull request #353 from Soerboe/fix20991

fix #20991 : Ledger line of normal note shortens if small note is above
Merge pull request #354 from mgavioli/Fix_21069_Instr_wizard_crash

Fix #21069 - Opening the "Create | Instruments.." dlg box causes crash
factorize mac head width computation in Chord