MBS-5848: Allow people to credit certain relationship attributes with free text
Updating creditable attribute support with recent changes in master
Output attributeCredits in /ws/js
Relationship editor support for instrument credits
Fix QUnit tests
Fix bug in removing instruments
Fix Relationship-related perl tests
Fix multiselect deselect
Make style between instrument/vocal UI consistently-spaced
Add/fix edit-related tests for instrument credits
Small tweaks
Use LinkAttributesArray in Edit::Relationship::Reorder
Remove extra newline
Use non_empty when serializing credited_as/text_value in /ws/js
Use non_empty when serializing text_value in XML/JSON webservices
Output attribute credits in /ws/2
Use non_empty to decide whether to interpolate credits/text values
Only output attribute-credits if at least one attribute is creditable
Add test for credited-as in /ws/2 XML
Support adding the same attribute with different credits