add interface use-cases to variable use-case item
add interface use-cases to variable use-case item

cellml/libcellml,hsorby/libcellml,nickerso/libcellml,MichaelClerx/libcellml,MichaelClerx/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,cellml/libcellml,MichaelClerx/libcellml,libcellml/buildbot-testing,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,libcellml/buildbot-testing,cellml/libcellml