Prepare 6.6.2

fix merge

Merge branch 'main' into dev

Merge pull request #1141 from stoyan/stoyan-issue-1140

fix direction of partial beam in some cases.

Tests for beamed rests

Formatting

Add helper functions to find non-rest elements

Prepare 6.6.1 release

fix repeat logic when user forgets to add a start repeat.

don't duplicate decorations when resolving overlays.

remove duplicate elements when copying repeats

remove duplicate elements when copying repeats

fix handling of overlays

formatting