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Provided REST APIs to create (add), get (read), delete (remove) relations.
Implemented displaying the name of the relation on mouseover for the issue and search graph and improved UI forgraph styles.
Improvements
Bugfix: QR code field displayed twice when it has two contexts - Global context and context with project.
Bugfix: Placeholders {reporter} and {assignee} in Lookup fields was not working.
UI improvements in table and list styles assets.
Hides 'link' icon for relations CFs, when user hasn't permissions to link/edit issue.