Test factorization
Renamed integration-data into fixtures as it is commonly done in test
suites.

Test output format
Make ReBar observer the ignore duration error properly
Add command to place articulations outside slurs
Update for new command
Removed "ops" suffix from filenames.
Refactored staffops file. (Vars and functions renaming)
Refactored clefs.
Refactored keysigs.
Refactored timesigs.
Refactored tuplets.
Minor refactoring.
Some more keysig refactoring.
Fixed warning.