smufl: add multi measure rest test
Parenthesized accidentals are drawn with the closing parenthesis right after the left parenthesis rather than after the accidental.

Fixed by positioning the three elements according to their actual width in Accidental::layout().
Fix mapping of Emmentaler double whole.

The double whole shapes with single and double side lines were exchanged.
Merge pull request #560 from mgavioli/Fix_double_whole_mapping

Fix mapping of Emmentaler double whole.
Merge pull request #559 from mgavioli/Fix_parenthesized_accidental_drawing

Fix parenthesized accidental drawing
adapt mtest